Tres Marias red-tailed hawk explained

The Tres Marias red-tailed hawk (Buteo jamaicensis fumosus) is a relatively small subspecies of red-tailed hawk endemic to Islas Marías, an island some 100km (100miles) off the coast of Mexico. Unlike some other island races, the validity of this race has rarely been called into question. The wing chord of males can range from 368to, averaging 369.3mm, and, in females, it ranges from 395to, averaging 397.4mm. Males and females average 228.9and in tail length, 85.9and in tarsal length and 27.4and in culmen length.^{[1] [2] [3] [4]} This race is similar to the western red-tailed hawk (B. j. calurus) but, beyond being noticeably smaller, is duskier and duller hued overall and has a more cinnamon wash below, with heavily dark barred thighs.

Notes and References

1. Book: Ferguson-Lees, J. . Christie, D. . amp . 2001 . Raptors of the World . . 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. Storer, R. W.. 1962. Variation in the Red-tailed Hawks of southern Mexico and Central America . Variación de los gavilanes colirrojos del sur de México y Centroamérica . The Condor . 64. 1. 77–78.
4. Blake, E. R. (1977). Manual of Neotropical Birds (Vol. 1). University of Chicago Press.