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
Small-toothed palm civet palm civets, this species is solitary, arboreal and nocturnal. Its gestation period is 45 days, and the average litter size is 3, which are born in dens made in the trees. Young open their eyes at 11 days and are weaned at two months. It can have two litters a year and there is no set mating season. It can live for 11 years. It is threatened primarily by deforestation, as are many Southeast Asian forest animals. Small-toothed palm civet The small-toothed palm civet ("Arctogalidia trivirgata"), also known as the three-striped palm civet, is a palm civet. It lives in