Red-tailed hawk (kemsiesi) explained

The red-tailed hawk kemsiesi (Buteo jamaicensis kemsiesi) is a dark subspecies of red-tailed hawk resident from Chiapas, Mexico, to Nicaragua. The wing chord of males can range from 357to, averaging 376mm, and, in females, it ranges from 362to, averaging 398.2mm. Males and females average 212.5and in tail length, 87.8and in tarsal length and 26.1and in culmen length.^{[1] [2] [3]} This race is similar to the southwestern red-tailed hawk (B. j. fuertesi) but markedly smaller, with its thighs barred with rufous. The dark wing marking may not be distinct in paler birds. A dark morph, similar to the western red-tailed hawk (B. j. calurus), is known to occur in this race.^{[4] [5]}

Notes and References

1. Book: Ferguson-Lees, J.. Raptors of the World. Christie, D.. Christopher Helm. 2001. 978-0-7136-8026-3. London.
2. Preston, C. R. & Beane, R. D. (2009). "Red-tailed Hawk (Buteo jamaicensis)". The Birds of North America. .
3. Blake, E. R. (1977). Manual of Neotropical Birds (Vol. 1). University of Chicago Press.
4. Palmer, R. S. ed. (1988). Handbook of North American Birds. Volume 5 Diurnal Raptors (Part 2).
5. Book: Howell . Steve N. G. . Webb . Sophie . amp . A Guide to the Birds of Mexico and Northern Central America . Oxford University Press . 1995 . 978-0-19-854012-0 . registration.