Juvenile Black Crowned Night Herons
Juvenile Black Crowned Night Herons (Nycticorax nycticorax) in their nests at the Baylands Nature Preserve in Palo Alto, California. Being brown, the chicks were hard to spot at first, but it was easy to tell they were there because of all the clucking. Here's a still image of them at Flickr.
Download: MPEG4 Video (.mp4)