Dull and lethargic during the day, lively and energetic at night, Black-crowned Night-Herons are specialized night-hunters. Come dusk they're more active, flying out to foraging sites, calling ‘wok’ as they pass high overhead in the darkness. They like marshy habitats and have a varied diet of fish, squid, crustaceans, aquatic insects, frogs, and snakes. | Audubon North Carolina