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? The song has been parodied several times, the best known of which is the American bawdy song "Seven Old Ladies", sung to the same tune but with different lyrics. Here are the chorus and the first two verses, of seven, as published in Ed Cray's "The Erotic Muse": <poem> Oh, dear, what can the matter be, Seven old ladies were locked in the lavat'ry, They were there from Monday till Saturday, And nobody knew they were there. The first old lady was 'Lizabeth Porter, She was the deacon of Dorchester's daughter, Went there to relieve a slight pressure of water,