Toothed whale swallow fishing hooks. Gillnetting and Seine netting are significant causes of mortality in cetaceans and other marine mammals. Porpoises are commonly entangled in fishing nets. Whales are also affected by marine pollution. High levels of organic chemicals accumulate in these animals since they are high in the food chain. They have large reserves of blubber, more so for toothed whales, as they are higher up the food chain than baleen whales. Lactating mothers can pass the toxins on to their young. These pollutants can cause gastrointestinal cancers and greater vulnerability to infectious diseases. They can also be poisoned by swallowing
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