The folks from Field Guide: Birds of the World IDed this as an immature Anna's (Calypte anna) juvenile in molt, with pollen on the beak giving it an unusual light appearance.
Ejemplar encontrado muerto en las áreas verdes de la Rectoría de la Universidad Autónoma de Tlaxcala
3 Chimney swifts seen flying low over VFW Lake about 0830 am. No photo.
Little dark curve-winged jet fighter with gray throat. Flying high for most part. Numbers have declined since earlier this summer when groups of 4-8 were common and frequently flew over during daylight.
Foto tomada por el ornitólogo Miguel Jaramillo en el Parque Andes - Reserva Ecológica de Montaña.
Foto tomada por el orintologo Miguel Jaramillo en el Parque Andes - Reserva Ecológica de Montaña
Traditionally, the bird order Apodiformes contained three living families: the swifts (Apodidae), the tree swifts (Hemiprocnidae), and the hummingbirds (Trochilidae). In the Sibley-Ahlquist taxonomy, this order is raised to a superorder Apodimorphae in which hummingbirds are separated as a new order, Trochiliformes. With nearly 450 species identified to date, they are the most diverse order of birds after the passerines.