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Butler, C. J., D. Ledbetter, N. Batchelder,
and G. Batchelder. 2007. Black-chinned Hummingbirds breed
in Grady County. Bulletin of the Oklahoma Ornithological Society
40: 13-16.
Lorenz, S., C. Butler, and J. Paz. 2006. First documented
nesting record of the Gray-crowned Yellowthroat (Geothlypis
poliocephala) in the United States in over a century.
Wilson Journal of Ornithology 118: 574-576.
Butler,
C. 2005. Feral parrots in the continental United States and
United Kingdom: Past, present and future. Journal of Avian
Medicine and Surgery 19: 142-149.
Butler,
C. & Gosler, A. 2004. Sexing and aging Rose-ringed Parakeets
Psittacula krameri in the UK. Ringing & Migration 22:
7-12.
Butler,
C. 2003. The disproportionate effect of climate change on
the arrival dates of short-distance migrant birds. Ibis 145:
484-495.
Butler, C. 2003. Hooded Merganser, Arctic Tern, California
Gull, Ring-billed Gull. In: Marshall, D. B., M. G. Hunter,
and A. L. Contreras (eds.) Birds of Oregon: a general reference.
Corvallis, OSU Press.
Butler,
C. 2003. Species status review: Monk Parakeets in Oregon.
Oregon Birds 29: 97-100.
Butler, C. 2003. Rose-ringed Parakeets in the UK. PsittaScene
15: 8-9.
Butler, C. 2003. A brief summary of some results of my PhD
research into “The population biology of the introduced
Rose-ringed Parakeet Psitacula krameri in the UK”. Runnymede
and Maple Cross Ringing Groups Annual Report 2002: 56-58.
Butler, C. 2002. Breeding parrots in Britain. British Birds
95: 345-348.
Butler, C., Hazlehurst, G., & Butler, K. 2002. First
nesting by Blue-crowned Parakeet in Britain. British Birds
95: 17-20.
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