white and a blue gray color phase. The night heron is dark above and light below, is smaller than the reef heron, and perches in a head-in, hump-backed manner. Both herons frequently fly from one island to the next in search of food, usually at sunrise and sunset.
Birds which migrate through Ulithi, nest, stay only during the winter, or are merely casual visitors, are shear-waters, tropic birds, man-o-war birds, various terns (including the dainty white fairy terns and gray-colored noddies), plovers, curlews, sandpipers, wandering tattlers, and turnstones.
In addition to the non-residential birds we might add chickens found on several islands (which have proved none too productive—their fertility is erratic and their products look more like ping-pong balls than hen eggs), and "Henry of Asor," of the Muscovy duck breed. There is also a captive green parakeet from the Phillippines residing near the Asor island navy dispensary.
Mammels on Ulithi include the Ulithi fruit bat, the Polynesian or small gray rat, and a large brown rat, house mouse, cat, dog, pig, as well as several monkeys introduced from the Philippines.
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