Stamps And Letters: 30 Mammal Facts

There are at least 80,000 humpback whales worldwide.

Adult whales can range in length from 12-16 metres and weigh approximately 36,000 kg.

They mainly feed off a diet of krill and small fish.

The wildcat hunts small mammals and birds.

Female wildcats produce one family a year in spring.

Unlike its domesticated cousin the wildcat is not keen on humans and keeps its distance, living on its own.

Brown long-eared bats are the second commonest species of bat in Britain.

They have large ears, hence the name, which are three quarters the length of their head and body.

Long-eared bats come out at night feeding on moths,caterpillars and spiders.

The polecat is a member of the Mustelidae family and is related to stoats, otters and minks.

They are solitary and nocturnal animals with each single polecat having a different musky scent.

They feed on small animals and eggs and so are not welcome by farmers.

The sperm whale is a toothed whale with the largest brain of any mammal.

It gets its name from the waxy substance called spermaceti found in the animal's head and resembling semen.

A bull can grow up to 20.5 metres long making it the largest living toothed animal.

On your marks, get so go!

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