White Chested Emerald, Asa Wright Nature Center, TrinidadThis is a white chested emerald. And yes, that is its tongue. Previously thought to suck up liquid via capillary action, ornithologists recently discovered through high speed video that hummingbirds actually use their long tongues to trap nectar by curling around it. This guy was at rest and obviously not sucking up nectar, so was probably just cleaning his tongue. Either that or he didn’t like getting his picture taken.
Nikon D810 with Nikkor 200-400mm lens (at 400mm) ISO 500, f/4 at 1/500th of a second