They live in Central America, they're nocturnal, and in many photos you can't see the crest.
Doodled from a photo in Gerald Carter's flickr photostream.
And because this is one of those birds that's "so nice they named it twice," here's a photo from a different angle so you can get a real sense of what the bill looks like.
Photo from the Wikipedia page for the Boat-billed Heron.
