ユカタンヌレバカケス Cyanocorax yucatanicus

Common and conspicuous in woodland and forest edge of Yucatan Peninsula, where there are no similar species. Usually found in groups of 5-25 birds, often chattering noisily. Black and bright blue plumage is distinctive. The bill is black on adult birds, yellow on juveniles and 1st-year birds. The striking white bodied juvenile plumage is held for only a few weeks in late summer before being replaced by adult-like black feathering.