Great blue herons, tri-colored herons, snowy egrets, great egrets, yellow-crowned night herons, roseate spoonbills, little blue herons, brown pelicans, white ibis, double-crested cormorants, and ospreys hunt in shallow waters and estuaries using specialized bodies and feeding behaviors. Great blue herons wade in deeper water than other herons and strike prey with powerful necks and sharp beaks, while tri-colored herons move gracefully or stand motionless among grasses to avoid detection. Snowy egrets stir the water with their feet to flush shrimp, crabs, insects, and fish, and great egrets stalk fish, snakes, and crustaceans alone in shallow water. Yellow-crowned night herons sleep in trees by day and feed especially on crabs at night, while roseate spoonbills sweep their sensitive spoon-shaped bills through shallow water for small fish, crabs, shrimp, and water insects. Little blue herons feed on small fish and insects, brown pelicans dive for fish and use throat pouches to separate their catch from water, white ibis probe wet mud for insects, worms, fiddler crabs, and small fish, double-crested cormorants swim and dive underwater for fish, and ospreys hover and dive for fish, their only food source.