Green herons are typically solitary and secretive birds, but if you find one, you often have an extended period of time to observe it, as they often slowly stalk their prey, or pose statue-like, sometimes for minutes at a time, while waiting to strike at a fish, frog or invertebrate. Three characteristics tell you that the green heron in this photograph is a juvenile: the few tufts of down that remain on its head, its streaked neck (adults have solid rufous necks) and its yellow legs (adults have orange legs).
After fledging when about three weeks old, they can soon fly. The juvenile fledglings continue to be fed by the adults for a period of time and are taught how to forage for fish. Green herons are one of very few bird species that are known to occasionally use a tool (insects, earthworms, twigs, feathers) to catch their food – they simply drop the lure and wait for small fish to appear. (A wonderful video of a green heron successfully using bread for this purpose can be seen at https://www.youtube.com/watch?v=Porp5v5lLKk.)
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Within 24 hours of hatching, downy Canada Goose goslings leave their nest and are capable of walking, swimming, diving and feeding themselves. Like many species of waterfowl, their growth is rapid. Contour feathers on their wings and tail begin to emerge in about three weeks (note wing feathers of gosling in photo). Feathers on a gosling’s head, neck and back are the last to appear. Just before a gosling develops the ability to fly, the last fluff of down, which is on top of its head, disappears.