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 matter be? Oh, dear, what can the matter be? Parents don't visit the school. They visit the circus, they visit their neighbors; They visit their flocks and the servant who labors; They visit the soldiers with murderours sabers; Now, why don't they visit the school? They care for their horses, they care for their dollars; They care for their parties and fancy fine collars; But little, we think, do they care for their scholars; Because they don't visit the school. We know we from hunger and cold are protected; In virtue and knowledge our minds are directed; But still