Juvenile Green Heron.

Compared with most herons, Green Herons are short and stocky, with relatively short legs and thick necks that are often drawn up against their bodies. They have broad, rounded wings and a long, dagger like bill. They sometimes raise their crown feathers into a short crest.
From a distance Green Herons look all dark. In better light they are deep green on the back with a rich chestnut breast and neck. The wings are dark gray. Juveniles are browner, with pale streaking on the neck and spots on the wings.
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