The Whipnose Anglerfish

We already know how strange the deep-sea anglerfish can get, but members of the Gigantactinidae, or whipnose seadevils, stand out in two perplexing ways. First, their natural fishing lures grow to extraordinary lengths, sometimes more than 10 times that of the animals entire body. Stranger still, all living examples of these creatures have been observed swimming upside-down. Why? No one knows.