What does "hooded" mean?

Additional senses

1. 2.Hood-shaped; esp. (Bot.), rolled up like a cornet of paper; cuculate, as the spethe of the Indian turnip.
2. 3.(Zoöl.) (a) Having the head conspicuously different in color from the rest of the plumage; -- said of birds. (b) Having a hoodlike crest or prominence on the head or neck; as, the hooded seal; a hooded snake. Hooded crow, a European crow (Corvus cornix); -- called also hoody, dun crow, and royston crow. -- Hooded gull, the European black-headed pewit or gull. -- Hooded merganser. See Merganser. -- Hooded seal, a large North Atlantic seal (Cystophora cristata). The male has a large, inflatible, hoodlike sac upon the head. Called also hoodcap. -- Hooded sheldrake, the hooded merganser. See Merganser. -- Hooded snake. See Cobra de capello, Asp, Haje, etc. -- Hooded warbler, a small American warbler (Sylvania mitrata).