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Jerry Olsen
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Jerry Olsen

   Biography

Jerry Olsen has studied birds of prey for 44 years, in the United States, Canada and Australia and, with other researchers, published some 150 papers and articles and five books on raptors. He is a member of the Institute for Applied Ecology at the University of Canberra. In 2002, with Susan Trost, Michael Wink and Hedi Sauer-Gürth, he discovered and named a new species in Indonesia, the Little Sumba Hawk-owl. In 2005 he alerted researchers to the catastrophic decline in Little Eagles in the Australian Capital Territory and has worked to explain this decline in relation to increasing rabbits, the poison Pindone used to control rabbits, and increased kangaroos driving an increase in Wedge-tailed Eagles which displace Little Eagles. With co-authors, he was the first to show that wild Peregrines fledged from bare cliff ledges can later breed in tree-nests, and discovered prey species said to be extinct in the ACT, such as Long-nosed Bandicoots, Squirrel Gliders and White-browed Babblers, in ACT raptor nests. He proposed a new model explaining Reversed Sexual Dimorphism in raptors based on the costs and benefits of curved beaks and talons, and linked 'Normal' Dimorphism in the Powerful Owl to population structures of their arboreal prey. In 2012 his book Australian High Country Owls received a Whitley Award.

Institute for Applied Ecology, University of Canberra
Institute for Applied Ecology  University of Canberra
Canberra,  A.C.T.  2601  Australia
Email: Jerry.Olsen@canberra.edu.au


   Research Interests

All duirnal and nocturnal Australian raptors, and certain Wallacean raptors such as the Bonelli's Eagle Hieraaetus fasciatus, Little Sumba Hawk-Owl Ninox sumbaensis, and Sumba Boobook Ninox rudolfi.

Species of Interest: 
  • Sumba Boobook
  • Little Sumba Hawk-owl
  • Whistling Kite
  • Brown Goshawk
  • White-bellied Sea Eagle
  • Little Eagle
  • Bonelli's Eagle
  • Wedge-tailed Eagle
  • Australian Kestrel
  • Black Falcon
  • Grey Falcon
  • Peregrine Falcon
  • Southern Boobook


   Publications

Olsen, J. 2014. Australian High Country Raptors. CSIRO Publishing. Melbourne.

Trainor, C., S. Debus, J. Olsen, J. Norman and L. Christidis 2013. Bonelli’s Eagle Aquila fasciata renschi in the Lesser Sundas, Wallacea: distribution, taxonomic status, likely origins and conservation status. Forktail 29: 100–106.

Olsen, J., S.J.S Debus and D. Judge. 2013. Declining Little Eagles Hieraaetus morphnoides and increasing rabbit numbers near Canberra: Is secondary poisoning by Pindone the problem? Corella 37: 33-35.       pdf

Olsen, J., S.J.S Debus, D. Judge and A. B. Rose. 2013. Diets of Wedge-tailed Eagles Aquila audax and Little Eagles Hieraaetus morphnoides breeding near Canberra, 2008-2009. Corella 37: 25-29.       pdf

Debus, S.J.S., J. Olsen, David Judge, and M. Butterfield. 2013. Numbers of breeding Little Eagles Hieraaetus morphnoides near Canberra in relation to atlas counts. Corella 37: 30-32.       pdf

Olsen, J., D. Judge, S. Trost, and A.B. Rose. 2013. Does the relative abundance of large versus small arboreal marsupials determine sexual dimorphism in Powerful Owls? Australian Field Ornithology 30:22-39       pdf

Olsen, J. and S.J.S Debus 2013 Do Tasmanian Southern Boobooks migrate? Australian Field Ornithology 30: 106-108.       pdf

Olsen, J., D. Judge, S. Trost and A. B. Rose 2013. Do Inverse Population Densities of Possums and Gliders Determine Sexual Dimorphism in Powerful Owls? Australian Field Ornithology 30:22-39.

Olsen, J., S.J.S Debus, D. Judge and A. B. Rose. 2013. Diets of White-bellied Sea-Eagles Haliaeetus leucogaster and Whistling Kites Haliastur sphenurus breeding near Canberra, 2003-2008. Corella 37: 13-18.       pdf

Olsen, J., D. Judge, S. Trost and J. Lisle 2013. Prey deliveries at eight territories of the Southern Boobook Ninox novaeseelandiae in Canberra. Corella 37: 7-12       pdf

Olsen, J. 2013. Reversed Sexual Dimorphism and Prey Size Taken by Male and Female Raptors: A Comment on Pande and Dahanukar (2012). J. of Raptor Research 47: 79-81.       pdf

McDonald, Paul G., J. Olsen and A.B. Rose 2012. The diet of breeding Brown Falcons Falco berigora in the Canberra region. J. of Raptor Research 46(4): 394–400.       pdf

Olsen, J. 2012. Do the costs and benefits of hooked beaks and talons drive RSD in raptors? Boobook 30(1):9-13.       pdf

Olsen, J., M. Osgood, M. Maconachie, G. Dabb & and M. Butterfield 2012. Little Eagles, Whistling Kites and Swamp Harriers in the Australian Capital Territory 2010. Canberra Bird Notes 36: 155-157.

Olsen, J. 2011. (Book) Australian high country owls. CSIRO Publishing, Colingwood, Victoria, Australia.

Olsen, J. 2011. Does Upside-down abundance of possums and gliders make male Powerful Owls big? Boobook 29 (2): 49-50.       pdf

Olsen, J., D. Judge, S. Trost, A.B. Rose, G. Flowers, J. McAuliffe, R. Lawrence, and M. Monachie. 2011. Powerful Owl Ninox strenua diet from two sites in the Australian Capital Territory. Australian Field Ornithology 28:120-128.       pdf

Olsen, J., A.B. Rose, and W.E. Boles. 2011. Black Falcon taken by Peregrine Falcon. Australian Field Ornithology 28:133-135.        pdf

Olsen, J., J.A. Downs, T. Tucker, and S. Trost. 2011. Home-range size and territorial calling of Southern Boobooks (Ninox novaseelandiae) in adjacent territories. Journal of Raptor Research 45:136-142.       pdf

Olsen, J., and S. Debus. 2011. Conspicuous prey taken by raptors and butcherbirds. Boobook 29:9-11.       pdf

Debus, S., and J. Olsen. 2010. Some aspects of the biology of the Black Falcon Falco subniger. Corella 35:29-36.       pdf

Olsen, J., D. Judge, E. Fuentes, A.B. Rose, and S. Debus. 2010. Diets of Wedge-tailed Eagles (Aquila audax) and Little Eagles (Hieraaetus morphnoides) breeding near Canberra, Australia. Journal of Raptor Research 44:50-61.       pdf

Olsen, J., S. Debus, and S. Trost. 2010. Is the Timor Southern Boobook a separate species? Boobook 28(1):10.        pdf

Olsen, J., M. Osgood, M. Maconachie, G. Dabb, and M. Butterfield. 2010. Little Eagles, Whistling Kites and Swamp Harriers in the Australian Capital Territory 2009. Canberra Bird Notes 35:81-84.       pdf

Olsen, J., S. Trost, and D. Judge. 2010. Calling behaviour of the Southern Boobook Ninox novaeseelandiae in relation to distance from their nest trees. Corella 34:11-13.        pdf

Olsen, J., M. Osgood, M. Maconachie, G. Dabb, and and M. Butterfield. 2009. Numbers of breeding Little Eagles Hieraaetus morphnoides in the Australian Capital Territory in 2008. Canberra Bird Notes 34:81-85.       pdf

Olsen, J., and S. Trost. 2009. Common Brushtail Possums Trichosurus vulpecula evicts nestling Southern Boobook Ninox novaeseelandiae from its nest hollow. Australian Field Ornithology 26:46-52.       pdf

Olsen, J., S. Trost, and S.D. Myers 2009. Owls on the Island of Sumba, Indonesia. Australian Field Ornithology 26:2-14.       pdf

Olsen, J., E. Fuentes, D.M. Bird, A.B. Rose, and D. Judge. 2008. Dietary shifts based on prey availability in Peregrine Falcons and Australian Hobbies near Canberra, Australia. Journal of Raptor Research 42:125-137.       pdf

Olsen, J., M. Osgood, M. Maconachie, and G. Dabb. 2008. Numbers of breeding Little Eagles Hieraaetus morphnoides in the Australian Capital Territory in 2007. Canberra Bird Notes 33:77-80.       pdf

Olsen, J., S. Trost, and A.B. Rose. 2008. Southern Boobook Ninox novaeseelandiae pair feeding combined brood of six fledglings. Australian Field Ornithology 25:12-21.       pdf

Trost, S., J. Olsen, A.B. Rose, and S.J.S. Debus. 2008. Winter diet of Southern Boobooks Ninox novaeseelandiae in Canberra 1993-2004. Corella 32:66-70.       pdf

Fuentes, E., J. Olsen, and A.B. Rose. 2007. Diet, occupancy, and breeding performance of Wedge-tailed Eagles Aquila audax near Canberra, Australia 2002-2003: four decades after Leopold and Wolf. Corella 31:65-72.       pdf

Olsen, J. 2007. Molonglo housing expansion set to destroy eagle's habitat. Canberra Times, November 28, 2007:4-5.

Olsen, J., and S. Trost. 2007. Duelling and nest failure in Southern Boobooks Ninox novaeseelandiae. Australian Field Ornithology 24:13-25.       pdf

Olsen, J., and S. Trost. 2007. Diurnal raptors on the Island of Sumba, Indonesia in June/July and December/January 2001–2002. Australian Field Ornithology 24:158-166.       pdf

Olsen, J., E. Fuentes, and A.B. Rose. 2006. Male Peregrine Falcon Falco peregrinus macropus fledged from a cliff nest found breeding in a stick nest. Australian Field Ornithology 23:8-14.       pdf

Olsen, J., E. Fuentes, and A.B. Rose. 2006. Trophic relationships between neighbouring White-bellied Sea-Eagles Haliaeetus leucogaster and Wedge-tailed Eagles Aquila audax breeding on rivers and dams near Canberra. Emu 106:193-201.       pdf

Olsen, J., E. Fuentes, A.B. Rose, and S. Trost. 2006. Food and hunting of eight breeding raptors near Canberra, 1990-1994. Australian Field Ornithology 23:77-95.       pdf

Olsen, J., and M. Osgood. 2006. Numbers of breeding Little Eagles Hieraaetus morphnoides in the Australian Capital Territory in 2006. Canberra Bird Notes 31:178-182.       pdf

Fuentes, F., and J. Olsen. 2005. Breeding status of birds of prey living in the Canberra region 2002-03. Canberra Bird Notes 30:65-72.       pdf

Olsen J., and C.R. Trainor. 2005. A first breeding record of the Red-capped Plover Charadrius ruficapillus for Wallacea and notes on other waders observed at Tasi-Tolu, Timor-Leste. Australian Field Ornithology 22:1- 4.       pdf

Fuentes, E., J. Olsen, and A.B. Rose. 2005. Breeding diet at two Whistling Kite nests near Canberra. Australian Field Ornithology 22:122-125.       pdf

Olsen, J., and S. Debus. 2005. A comment on some errors in the literature regarding Australian owls. Corella 29:97-98.       pdf

Olsen, J., and E. Fuentes. 2005. Collapse in numbers of breeding Little Eagles Hieraaetus morphnoides in the Australian Capital Territory. Canberra Bird Notes 30:141-145.       pdf

Olsen, J., S. Debus, A.B. Rose, and G. Hayes. 2004. Breeding success, cliff characteristics, and diet of Peregrine Falcons in Namadgi National Park, Australian Capital Territory. Corella 29:33-37.       pdf

Olsen, J., and E. Fuentes. 2004. Preliminary report on the effect of the development of the Molonglo Valley on the community of birds of prey. Unpublished report to A.C.T. Planning and Land Authority. 36 pp.

Debus, S., J. Olsen, and A.B. Rose. 2004. Diet of the Barn Owl Tyto alba in north-eastern South Australia. Corella 28:40-42.       pdf

Boles, W., A.B. Rose, and J. Olsen. 2004. A record of the Long-tailed Jaeger Stercorarius longicaudus in the ACT. Australian Field Ornithology 21:158-162.       pdf

Olsen, J., and S. Trost. 2004. A lovers triangle. Canberra Bird Notes 29:16-18.

Olsen, J. 2003. Rehabilitating captive raptors in East Timor. Unpublished report to Timor-Leste Government. 17 pp.

Olsen, J., and S. Trost. 2003. Female desertion in Southern Boobooks. Pp. 121-125 in J.R. Duncan (ed.), Owls of the world: their lives, behavior and survival. Key Porter Books, Toronto, Ontario, Canada.       pdf

Olsen, J., and S. Trost. 2003. Do Southern Boobooks duet or duel? Canberra Bird Notes 28:45-52.        pdf

Olsen, J., and S. Trost. 2003. Discovery of a new owl species - the Sumba Hawk-Owl. Pp. 80-82 in J.R. Duncan (ed.), Owls of the world: their lives, behavior and survival. Key Porter Books, Toronto, Ontario, Canada.       pdf

Olsen, J., and A.D. Tucker. 2003. A brood size manipulation experiment with five nests of Peregrine Falcons Falco peregrinus near Canberra. Emu 103:127-132.       pdf

Newton, I., R. Kavanagh, J. Olsen, and I. Taylor (eds.). 2002. (Book) The ecology and conservation of owls. CSIRO, Melbourne, Australia.

Olsen, J., B.G. Marcot, and S. Trost. 2002. Do Southern Boobooks Ninox novaeseelandiae duet? In I. Newton, R. Kavanagh. J. Olsen, and I. Taylor (ed.), The ecology and conservation of owls. CSIRO, Melbourne, Australia.       pdf

Olsen, J., S. Trost, and G. Hayes. 2002. Vocalisations used by Southern Boobooks Ninox novaeseelandiae in and adjoining Aranda Bushland, Canberra, Australia. In I. Newton, R. Kavanagh. J. Olsen, and I. Taylor (ed.), The ecology and conservation of owls. CSIRO, Melbourne, Australia.       pdf

Olsen, J., M. Wink, H. Sauer-Gürth, and S. Trost. 2002. A new Ninox owl from Sumba, Indonesia. Emu 102:223-231.       pdf

Olsen, J., and S. Taylor. 2001. Winter home range of an adult female Southern Boobook Owl Ninox novaeseelandiae near Parliament House, Canberra. Australian Bird Watcher 19:109-114.       pdf

Olsen, J. 1997. Notes on Sanford's Sea-eagle Haliaeetus sanfordi and other raptors in the Solomon Islands. Australian Bird Watcher 17:81-86.

Olsen, J., and S. Trost. 1997. Territorial and nesting behaviour in Southern Boobooks (Ninox novaeseelandiae). Pp. 308-313 in J.R. Duncan, D.H. Johnson, and T.H. Nicholls (eds.), Biology and conservation of owls of the Northern Hemisphere: 2nd International Symposium, February 5-9 1997, Winnipeg, Manitoba. U.S. Department of Agriculture, Forest Service, General Technical Report NC-190, St. Paul MN.       pdf

Olsen, J., and E. Stevenson. 1996. Female Peregrine Falcon replaces an incubating female and raises her young. Australian Bird Watcher 16:205-210.       pdf

Olsen, J. 1995. Review of the diurnal birds component of the Eden Management Area Environmental Impact Statement (November 1994). Unpublished report to New South Wales National Parks and Wildlife Service, Queanbeyan, NSW, Australia. 16 pp.

Olsen, J., and R. Rehwinkle. 1995. Peregrine Falcons and Powerful Owls in Namadgi and Tidbinbilla Nature Reserves, A.C.T. Unpublished report. National Estate Grant 1993-1995. 103 pp.       pdf

Olsen, J. 1994. (Book) Some time with eagles and falcons. Applied Ecology Research Group, Canberra, Australia (reprinted in 1995 by Hancock House, Blaine, WN).

Olsen, J. 1994. (Review of) Handbook of Australian, New Zealand and Antarctic Birds. Volume 2. Raptors to lapwing, edited by S.J. Marchant and P. Higgins. Canberra Times, Canberra, Australia.

Olsen, J. 1994. Review of fauna report for Queanbeyan-Badja Management Area: diurnal and nocturnal birds. Unpublished report to New South Wales National Parks and Wildlife Service, Queanbeyan, NSW, Australia. 7 pp.

Olsen, J., and G. Hayes. 1994. White-throated Nightjar: a new breeding species for the A.C.T. Australian Bird Watcher 15:229.

Olsen, J. 1993. Does the breeding system of some raptors help maintain a buffer against food shortage? Australasian Raptor Association News 13:66-67.

Olsen, P., F. Crome, and J. Olsen. 1993. (Book) Birds of prey and game birds of Australia. Angus and Robertson, Sydney, Australia.

Olsen, P., and J. Olsen. 1993. Black Falcon. In S.J. Marchant and P. Higgins (eds), Handbook of Australian, New Zealand and Antarctic Birds. Volume 2. Raptors to lapwing. Oxford University Press, Melbourne, Australia.

Olsen, P., and J. Olsen. 1993. Grey Falcon. In S.J. Marchant and P. Higgins (eds), Handbook of Australian, New Zealand and Antarctic Birds. Volume 2. Raptors to lapwing. Oxford University Press, Melbourne, Australia.

Olsen, J., and A. Georges. 1993. Do peregrine fledglings reach independence during peak abundance of their main prey? Journal of Raptor Research 27:149-153.       pdf

Olsen, P., J. Olsen, and I. Mason. 1993. Breeding and non-breeding diet of the Peregrine Falcon Falco peregrinus near Canberra, prey selection, and the relationship between diet and reproductive success. Pp 55-77 in P.D. Olsen (ed), Australian raptor studies. Royal Australasian Ornithologists' Union, Melbourne, Australia.

Olsen, J., P. Olsen, T. Billett, and J. Jolly. 1993. Observations on the breeding diet of the Peregrine Falcon in South Australia. Pp 81-83 in P.D. Olsen (ed.), Australian Raptor Studies. Royal Australasian Ornithologists Union, Melbourne, Australia.

Olsen, J. 1992. Raptors in Molonglo Gorge. Unpublished report to ACT Forestry. 24 pp.

Olsen, J. 1992. Raptors in Namadgi, Canberra Nature Parks, the Murrumbidgee River Corridor, and Googong Foreshore. Unpublished report to ACT Parks and Conservation. 48 pp.

Olsen, P., and J. Olsen. 1992. Does rain hamper hunting by breeding raptors? Emu 92:184-187.

Olsen, J. 1991. Sexual dichromatism in raptors. Australasian Raptor Association News 12:16.

Olsen, P., D. Mallinson, and J. Olsen. 1991. The bird community of Mt. Mugga, ACT: June 1982 to January 1986. Australian Bird Watcher 14:13-23.

Mallinson, D., P. Olsen, and J. Olsen. 1990. A note on the breeding of the Little Eagle Hieraeetus morphnoides and other raptors on Mt. Mugga, ACT. Corella 14:88-91.

Olsen, J. 1990. (Book) Caring for birds of prey. Applied Ecology Research Group. Canberra, Australia (reprinted in 1994 by Wild Ones Books, Springville, CA).       pdf

Olsen, J. 1990. Powerful owls, possums and reversed size dimorphism. Australasian Raptor Association News 11:10-11.

Olsen, J. 1990. RSD: large females and smaller males may reduce chances of collision and robbery for the breeding pair. Australasian Raptor Association News 11:67-73.

Olsen, P.D., and J. Olsen. 1990. Canberra: city of raptors. Pp. 87 in I. Newton (ed.), Birds of prey. IPC, Sydney, Australia.

Olsen, P., and J. Olsen. 1989. Living with the world's most studied raptor. Birds International 11:23-31.

Olsen, P.D., and J. Olsen. 1990. Hybrids in nature and captivity. P. 116 in I. Newton (ed.), Birds of prey. IPC, Sydney, Australia.

Olsen, P., and J. Olsen. 1990. Australian raptors. Eyas 13:22-24.

Olsen, J. 1990. Eagles in advertising. Pp. 188 in I. Newton (ed.), Birds of prey. IPC, Sydney, Australia.

Olsen, J. 1990. Further thoughts on risk of accident and reversed sexual dimorphism in raptors. Australasian Raptor Association News 11:30-31.

Olsen, J., and P.D. Olsen. 1990. Birds of prey. Pp. 25-33 in L. Egerton (ed.), Favourite Australian birds. Bay Books, Sydney, Australia.

Bartos, R., P. Olsen, and J. Olsen. 1989. The Bartos Trap: a new raptor trap. Raptor Research 23:117-120.

Olsen, J. 1989. Some thoughts on risk of accidents in raptors. Australasian Raptor Association News 10:69-72.

Olsen, J. 1989. Do peregrines have nestlings during peak prey abundance?" Australasian Raptor Association News 10:72-73.

Olsen, P., and J. Olsen. 1989. Australia's Brown Falcon. Birds International 1:68-72.

Olsen, P.D., and J. Olsen. 1989. Breeding of the Peregrine Falcon Falco peregrinus. I. Weather, nest spacing and territory occupancy. Emu 88:195-201.

Olsen, J., and P. Olsen. 1989. Housing Wedge-tailed Eagles at the Sir Joseph Banks Fauna Park. Unpublished report to Bathurst City Council, Bathurst, New South Wales, Australia. 10 pp.

Olsen, P.D., and J. Olsen. 1989. Breeding of the Peregrine Falcon Falco peregrinus. II. Weather, nest quality and the timing of egglaying. Emu 89:1-5.

Olsen, P.D., and J. Olsen. 1989. Breeding of Peregrine Falcons Falco peregrinus. III. Weather, nest quality and breeding success. Emu 89:6-14.

Ross, T., P. Olsen, J. Olsen, R. Metcalfe. 1989. Incubation period of the Collared Sparrowhawk. Australian Bird Watcher 13:59-61.

Olsen, P.D., N.J. Mooney, and J. Olsen. 1989. Status and conservation of the Norfolk Island Boobook Ninox novaeseelandiae undulata. Pp. 415-422 in B.-U. Meyburg and R.D. Chancellor (eds.), Raptors in the modern world. World Working Group on Birds of Prey and Owls, Berlin.

Olsen, J. 1988. Hacking pregrines at Sutton, 1987-1988. Australasian Raptor Association News 9:44-45.

Olsen, P., and J. Olsen. 1988. (Review of) The sparrowhawk, by Ian Newton. Emu 88:61-62.

Olsen, P.D., and J. Olsen. 1988. Population trends, distribution and status of the Peregrine Falcon in Australia. Pp. 255-274 in T.J. Cade, J.H. Enderson, C.G. Thelander, and C.M. White (eds.), Peregrine Falcon populations: their management and recovery. The Peregrine Fund, Boise, ID.

Olsen, P., and J. Olsen. 1988. The Peregrine Falcon. Tambourine Mountain Natural History Magazine 15:13-14.

Ross, T., and J. Olsen. 1988. Starling flock behaviour thwarts a Black Falcon attack. Australian Bird Watcher 12:239-240.

Olsen, J. 1987. Description of another Powerful Owl nest. Canberra Bird Notes 12:24.

Olsen, J., and P. Olsen. 1987. Further comments on hack. Australasian Raptor Association News 8:65-66.

Olsen, P.D., and J. Olsen. 1987. Measurements and seasonal movements of the Australian Kestrel Falco cenchroides. Emu 87:35-41.

Olsen, P., and J. Olsen. 1987. Are hormone levels in prey proximate timers for breeding raptors? Australasian Raptor Association News 8:49-50.

Olsen, P.D., T. Ross, and J. Olsen. 1987. Vestigial wing claws in Australian birds of prey. Australian Bird Watcher 12:20-21.

Olsen, P.D., and J. Olsen. 1987. Sexual size dimorphism in raptors: intrasexual competition in the larger sex for a scarce breeding resource, the smaller sex. Emu 87:59-62.

Olsen, P.D., and J. Olsen. 1987. Estimating the age of nestling raptors. Australian Bird Watcher 12:130-131.

Olsen, P.D. and J. Olsen. 1987. Egg weight loss during incubation in the Australian Kestrel Falco cenchroides and Brown Goshawk Accipiter fasciatus in captivity. Emu 87:196-199.

Olsen, P.D., and J. Olsen. 1987. Special contributors -- diurnal birds of prey. Pp 6-15 in D. and M. Trounson (eds.), Australia: land of birds. Collins, Sydney, Australia.

Olsen, P., and J. Olsen. 1987. The kestrel: Australia's smallest falcon. Australian Natural History 22:284-288.

Olsen, J. 1986. (Review of) Eagles, hawks and falcons of Australia, by David Hollands. Corella 10:35-36.

Olsen, J. 1986. An unusual incident with a Bald Eagle. Raptor Research 20:41.

Olsen, J., and P. Olsen. 1986. On the under-wing pattern of the Little Eagle and Booted Eagle. Australasian Raptor Association News 7:50.

Olsen, J., and P. Olsen. 1986. Observation on hack of a Peregrine Falcon. Australasian Raptor Association News 7:70-71.

Olsen, P., and J. Olsen. 1986. Frogmouths and nightjars - masters of camouflage. Living Australia 90:14.

Olsen, P.D., and J. Olsen. 1986. Distribution, status, movements and breeding of the Grey Falcon Falco hypoleucos. Emu 86:47-50.

Olsen, P., and J. Olsen. 1986. Secretive shortwings. Living Australia 98:17-20.

Olsen, P., and J. Olsen. 1986. Why are female raptors larger than males? Australasian Raptor Association News 10:12-14.

Olsen, P., and J. Olsen. 1986. Estimating the age of nestling raptors. Australasian Raptor Association News 7:48-49.

Olsen, P.D., and J. Olsen. 1985. Preliminary report on changes in egg-shell thickness of Australian Falco. ICBP Technical Publication 5:389-392.

Olsen, J. 1985. Captive breeding of Australian raptors. ICBP Technical Publication 5:431-432.

Olsen, P., and J. Olsen. 1985. The Osprey - patroller of Australia's coastline. Living Australia 82:6-9.

Olsen, P.D., and J. Olsen. 1985. A natural hybridisation of the Brown Goshawk Accipiter fasciatus (Vigors and Horsfield) and Grey Goshawk Accipiter novaehollandiae (Gmelin) in Australia, and a comparison of the two species. Emu 85:250-257.

Olsen, J. 1984. (Review of) Hawks in focus, by Jack and Lindsay Cooper. Emu 84:125-126.

Olsen, P., and J. Olsen. 1984. (Review of) The Peregrine Falcon, by Derek Ratcliffe. Emu 84:126-127.

Olsen, P., and J. Olsen. 1984. The falcons of the world, by Tom Cade. Australian Wildlife Research 11:205-206.

Olsen, J., and P. Olsen. 1983. Raptor prey selection. Australasian Raptor Association News 4:7-8.

Olsen, J., and P. Olsen. 1983. Size dimorphism in raptors. Australasian Raptor Association News 4:2.

Olsen, P., and J. Olsen. 1983. (Review of) The study of raptor populations, by Donald R. Johnson. Emu 83:204.

Olsen, P.D., J. Olsen, and N.J. Mooney. 1982. Growth and development of twelve captive-bred and five wild-bred nestling Brown Goshawks Accipiter fasciatus, with details of breeding biology. Emu 82:189-194.

Olsen, J., T. Billet, and P. Olsen. 1982. A method for reducing illegal removal of eggs from raptor nests. Emu 82:225.

Olsen, J., and P. Olsen. 1981. Natural breeding of Accipiter fasciatus in captivity with notes on release of young. Raptor Research 15:53-57.

Olsen, P., and J. Olsen. 1981. DDT: peregrines in peril? RAOU Newsletter 49:1-3.

Olsen, J., and P. Olsen. 1980. Some considerations for future raptor rehabilitation. Raptor Research 14:10-12.

Olsen, J., and P. Olsen. 1980. Observations on defence of the nest against humans by Australian Falco. Emu 80:163-165.       pdf

Olsen, J., and P. Olsen. 1980. Information derived from captive raptors: a selected review. Corella 4:25-29.

Olsen, P., and J. Olsen. 1980. Observations on development, nesting chronology, and clutch and brood size in the Australian Kestrel Falco cenchroides. Australian Wildlife Research 7:247-255.

Olsen, J., and P. Olsen. 1980. Alleviating the impact of human disturbance on the breeding peregrine falcon. II. Public recreational lands. Corella 4:54-57.       pdf

Olsen, P., and J. Olsen. 1980. (Review of) First aid and care of wild birds, edited by J.E. Cooper and J.T. Eley. Emu 80:246-247.

Olsen, P., and J. Olsen. 1980. (Review of) Eleonora's Falcon: adaptations to prey and habitat in a social raptor, by Hartmut Walter. Emu 80:245-246.

Olsen, P., W.J.M. Vestjens, and J. Olsen. 1979. Observations on the diet of the Australian Kestrel Falco cenchroides. Emu 79:133-138.

Olsen, P., and J. Olsen. 1979. Eggshell thinning in the peregrine Falco peregrinus (Aves: Falconidae) in Australia. Australian Wildlife Research 6:217-226.

Olsen, J., J. Jolly, and P. Olsen. 1979. Observations on interspecific conflict in the Peregrine Falco peregrinus, and other Australian falcons. Australian Bird Watcher 8:51-57.

Olsen, P., and J. Olsen. 1978. Alleviating the impact of human disturbance on the breeding Peregrine Falcon. I. Ornithologists. Corella 2:1-7.

Olsen, J. 1975. The Black Falcon in the field. Canberra Bird Notes 3:6-9.

Olsen, J., and P. Woollard. 1975. The use of the bal-cha-tri in banding. Canberra Bird Notes 3:8-9.

Olsen, J. 1974. Investigation into the biology of the Peregrine Falcon and Black Falcon in the Port Augusta - Wilmington Area, South Australia. Unpublished report to South Australia National Parks and Wildlife Service. 36 pp.

Olsen, J. & Hull, C. (1990) Why do Australian Peregrine Falcons have larger beaks than their conspecifics? Australasian Raptor Association News Vol. 11: (3) pp. 46-47.



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