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 but otherwise very similar, and can often be distinguished only by close inspection of its teeth which are unpigmented. The greater white-toothed shrew is distinguished by a careful examination of their unpigmented teeth. Like other "white toothed-shrews", "C. russula" lacks the deposition of iron in their enamel at the tips of their teeth This particular species has a greyish or reddish brown upper coat with a yellowish grey coat in the underside The greater white-toothed shrews are part of the medium-sized shrews and weigh around 11 grams to 14 grams The head and body length of "C. russula" is about