White-tailed eagle more vulnerable than many. Besides vulnerability, habitat and prey behaviour, fish body size may be a driver in the piscivorian dietary preferences. Studies have indicated that fish less than are taken infrequently, since they have a lower yield, fish of up to are taken secondarily and fish between are preferred since they have the highest nutritional benefit. Fish taken can exceed but since they can start to considerably exceed the weight of the eagle itself, they may be prove too difficult to overpower. One large Atlantic halibut ("Hippoglossus hippoglossus") was found with the disembodied feet of a white-tailed eagle still
Flying fish striking their prey. The oldest known fossil of a flying or gliding fish, "Potanichthys xingyiensis", dates back to the Middle Triassic, 235–242 million years ago. However, this fossil is not related to modern flying fish, which evolved independently about 66 million years ago. The term Exocoetidae is both the scientific name and the general name in Latin for a flying fish. The suffix "-idae", common for indicating a family, follows the root of the Latin word "", a transliteration of the Ancient Greek name . This means literally "sleeping outside", from "outside" and "bed", "resting place", verb root κει- "to