The water shrew is the largest of the British shrews, and is the only native venomous mammal. It is a carnivore, and uses venom in its saliva to stun its prey. It is a tiny creature, about the size of a plum! Water shrews eat aquatic invertebrates, worms and small fish. They have such a fast metabolism that they have to eat round the clock. They have iron in the tip of their teeth, which keeps them sharp. They do not hibernate so are active all year round. At Wildwood most of our water shrews are involved with breeding and scientific study programmes, but we do have some of these amazing animals on view opposite the Otter pond.