Why do some killer whales dorsal fins flop over?
Scientists are not sure why the dorsal fins of some killer whales flop over and the dorsal fins of other do not.The dorsal fins of killer whales are supported only by connective tissue and not bone. In a study of killer whales in New Zealand waters, 23% of the wild males had dorsal fins that bent over. Newborn killer whales all have floppy dorsal fins that stiffen a few days after birth.