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
Greater white-toothed shrew and other small carnivorous mammals such as weasels are the main predators of "C. russula". In order to avoid predation, the greater white-toothed shrews can be found undercover of vegetation or leaf litter when active. Cryptic coloration is also used as an effective method to avoid predation. The greater white-toothed shrews are classified as semi-social mammals. During winter, "C. russula" are found sharing nests and enter torpor. Mated pairs are found guarding their territories together. "C. russula" are highly monogamous and exhibit a female-biased dispersal, which is highly uncommon in mammals. This dispersal pattern can also occur due to infiltration