Violetear Hummingbird. Of genus Colibri, a med. to lg species found in Mexico, & Central & northern S. America. The Green Violetear occasionally wanders north as far as the US & even Canada. They have rounded tails & short-medium black bills. 3 of the 4 species have mainly green plumage. Males have a violet blue patch running back & down from the eye, which is erected when they are excited, & a glittering throat patch. The female looks like the male, but the ear & throat patches are smaller.
I think I have figured out why this bird is called a violet-ear I've been in the hummingbird aviary at the zoo a lot. I've seen this bird pretty much every time. Today was the first time I saw it do this. Another bird was getting a drink or something above it and it got mad. These ear-flaps suddenly flipped up and it chittered up a storm.
A wonderful picture of a Violet-tailed Sylph (Aglaiocercus coelestis) near the lodge. Photo: Joao Krajewski.
Green violet bearded helmetcrest from Colombia - by BobLewis (The Bearded Helmetcrest (Oxypogon guerinii) is a species of hummingbird in the family Trochilidae. It is found in Colombia and Venezuela. Its natural habitat is subtropical or tropical high-altitude grassland, known as páramo.)