Крабовая кваква Nyctanassa violacea

Often inconspicuous heron, roosts in trees by day. Feeds nocturnally, specializing on crabs. Adults have bold black-and-white head pattern and gray body. Brown immatures similar to Black-crowned Night-Heron. Yellow-crowned has longer legs and neck; thicker bill. Legs project beyond the tail in flight. Juvenile Yellow-crowned has smaller white spots on wing coverts than Black-crowned.