Evolution of cetaceans "Caperea marginata") all have derived characteristics presently unknown in any cetothere and vice versa (such as a sagittal crest). The adaptation of echolocation occurred when toothed whales (Odontoceti) split apart from baleen whales, and distinguishes modern toothed whales from fully aquatic archaeocetes. This happened around 34 million years ago in a second cetacean radiation. Modern toothed whales do not rely on their sense of sight, but rather on their sonar to hunt prey. Echolocation also allowed toothed whales to dive deeper in search of food, with light no longer necessary for navigation, which opened up new food sources. Toothed whales
Oh Dear! What Can the Matter Be? exaggerates one common trait (one so thin she falls through a knot-hole). Suggested alternate lyrics include: <poem> Oh, dear, what can the matter be, Six old maids were stuck in the lavat'ry, They were there from Sunday till Saturday, Nobody knew they were there The first one in was fat lady Humphreys - squeezed herself down and she said "it's quite comfy" but when she was through she could not get her bum free – and nobody knew she was there. Refrain The next one there was old lady Grayson – she couldn't get in so she peed in the