Snallygaster

"'People who say there is no such animal are the ones who need to get right — we are not,' he stated emphatically today. 'I saw the snallygaster,' he repeated, 'and I saw him change from white to black.'" — The News (Frederick, MD), November 28, 1932

Definition:

: a mythical nocturnal creature that is reported chiefly from rural Maryland, is reputed to be part reptile and part bird, and is said to prey on poultry and children

Photo credit: Tory Novikova

Source: Top Ten Lists: Monster of the Day from Merriam-Webster Online
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Never heard of this...perhaps people stopped seeing it a few decades ago ;))