Tricolored Heron (immature)

This species measures from 56 to 76 cm (22 to 30 in) long and has a wingspan of 96 cm (38 in).[2] The slightly larger male heron weighs 415 g (14.6 oz) on average, while the female averages 334 g (11.8 oz).[3] It is a medium-large, long-legged, long-necked heron with a long pointed yellowish or greyish bill with a black tip. The legs and feet are dark.
Adults have a blue-grey head, neck, back and upperwings, with a white line along the neck. The belly is white. In breeding plumage, they have long blue filamentous plumes on the head and neck, and buff ones on the back.
http://en.wikipedia.org/wiki/Tricolored_heron