Due to its presence in all the continents common rat is considered as the second most successful animal after humans. About 82 million rats reside in UK and these figures would mean that there are 1-3 rats per person in the country. These are often used as model organisms for scientific research.

The house mouse, one of the most numerous species of the genus Mus. It is the second most common Mammal in the UK, with estimated number of 76,201,000. It has a shorter tail than common rat. It is very variable in colour being Grey, brown or almost black with 15-24 gram weight and length of 75-10 cm. House mouse are mostly active during dusk or night, as they do not like bright lights.

They are the third most common mammals in UK with estimated presence of 75,723,000 voles. The field vole is a Grey-brown mammal, around 11omm in length and only a short tail. They are found in moist grassy habitats, such as woodlands, marshs, or river banks. Each one of this mammal has its own territory which it defends from other voles.

This is the forth most common mammal in UK and their estimated population is 43,200,010. They are abundant in woodlands, grasslands and hedgerows. Its total body length is 55-82 mm and weight 5-12 grams. Common shrews are insectivorous and carnivorous animals, feeding on insects, spiders and worms. They eat 80-90% of their own body weight of food daily.

Wood Mouse is the fifth most common mammal(41,601,123) in UK. They inhabit a range of habitats including forests edge, gardens, woodland and grassland. They may eat small invertebrates such as snails and insects. They are very active during night and are active climbers. They also found in North Africa and on many islands.

The Rabbit lives in many areas around the world. But they are most common mammal in UK with total estimated population of 40,522,000. Rabbits are herbivores who feed by grazing on grass and leafy weeds. When they feed they do not move far from home , so that a short dash can take them to safety. Rabbits are very beautiful and friendly animals but interestingly they like to play with dogs.

Mole is the seventh common mammalian in UK with estimated number of 36,155,000. Moles can also be found in North America, Asia and Europe but there are no moles in Ireland. A mole’s diet primarily consists of earthworms and other small invertebrates found in the soil.

Bank Voles are widespread across mainland UK with estimated number of population of 30,124,000. Their life span is up to 18 months. Bank Voles live in underground chambers lined with moss, feathers and vegetable fiber. Their size can range anywhere from 8-12 cm in length and 15-40 grams in weight. Bank Voles feed on leaves; fruits, buds and small insects. They are active during the day and night.

Pygmy Shrew is the ninth most common mammal in UK with population of 9,900,000. British Pygmy shrew are protected by the wildlife and countryside. According to a 1981 act, and it is prohibited to kill them without a special license. Their body length is estimated of 42-62 mm and total weight is 2.5-6 grams. They are mostly found in grasslands and forests. They feed spiders snails, slugs, insects and spiders.

Grey Squirrel is the tenth most common mammal in UK with a population of 6,730,000. They eat a wide range of foods such as fungi, tree bark and some types of seeds. The head and body length is from 23 to 30 cm, the tail from 19 to 25 cm and the adult weight varies between 400 and 600 grams. They build a type of nest, known as a drey, in the forks of trees.