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Main article: Fauna of Great Britain

The robin is popularly known as "Britain's favourite bird".^[57]
Animal diversity is modest, as a result of factors including the island's small land area, the relatively recent age of the habitats developed since the last glacial period and the island's physical separation from continental Europe, and the effects of seasonal variability.^[58] Great Britain also experienced early industrialisation and is subject to continuing urbanisation, which have contributed towards the overall loss of species.^[59] A DEFRA (Department for Environment, Food and Rural Affairs) study from 2006 suggested that 100 species have become extinct in the UK during the 20th century, about 100 times the background extinction rate. However, some species, such as the brown rat, red fox, and introduced grey squirrel, are well adapted to urban areas.
Rodents make up 40% of the mammal species.^{[citation needed]} These include squirrels, mice, voles, rats and the recently reintroduced European beaver.^[59] There is also an abundance of European rabbit, European hare, shrews, European mole and several species of bat.^[59] Carnivorous mammals include the red fox, Eurasian badger, Eurasian otter, weasel, stoat and elusive Scottish wildcat.^[60] Various species of seal, whale and dolphin are found on or around British shores and coastlines. The largest land-based wild animals today are deer. The red deer is the largest species, with roe deer and fallow deer also prominent; the latter was introduced by the Normans.^[60][61] Sika deer and two more species of smaller deer, muntjac and Chinese water deer, have been introduced, muntjac becoming widespread in England and parts of Wales while Chinese water deer are restricted mainly to East Anglia. Habitat loss has affected many species. Extinct large mammals include the brown bear, grey wolf and wild boar; the latter has had a limited reintroduction in recent times.^[59]
There is a wealth of birdlife, with 628 species recorded,^[62] of which 258 breed on the island or remain during winter.^[63] Because of its mild winters for its latitude, Great Britain hosts important numbers of many wintering species, particularly waders, ducks, geese and swans.^[64] Other well known bird species include the golden eagle, grey heron, common kingfisher, common wood pigeon, house sparrow, European robin, grey partridge, and various species of crow, finch, gull, auk, grouse, owl and falcon.^[65] There are six species of reptile on the island; three snakes and three lizards including the legless slowworm. One snake, the adder, is venomous but rarely deadly.^[66] Amphibians present are frogs, toads and newts.^[59] There are also several introduced species of reptile and amphibian.^[67]
Flora
See also: List of the vascular plants of Britain and Ireland

Heather growing wild in the Highlands at Dornoch
In a similar sense to fauna, and for similar reasons, the flora consists of fewer species compared to much larger continental Europe.^[68] The flora comprises 3,354 vascular plant species, of which 2,297 are native and 1,057 have been introduced.^[69] The island has a wide variety of trees, including native species of birch, beech, ash, hawthorn, elm, oak, yew, pine, cherry and apple.^[70] Other trees have been naturalised, introduced especially from other parts of Europe (particularly Norway) and North America. Introduced trees include several varieties of pine, chestnut, maple, spruce, sycamore and fir, as well as cherry plum and pear trees.^[70] The tallest species are the Douglas firs; two specimens have been recorded measuring 65 metres or 212 feet.^[71] The Fortingall Yew in Perthshire is the oldest tree in Europe^.
There are at least 1,500 different species of wildflower. Some 107 species are particularly rare or vulnerable and are protected by the Wildlife and Countryside Act 1981. It is illegal to uproot any wildflowers without the landowner's permission.A vote in 2002 nominated various wildflowers to represent specific counties. These include red poppies, bluebells, daisies, daffodils, rosemary, gorse, iris, ivy, mint, orchids, brambles, thistles, buttercups, primrose, thyme, tulips, violets, cowslip, heather and many more.
There is also more than 1000 species of bryophyte including algae and mosses across the island. The currently known species include 767 mosses, 298 liverworts and 4 hornworts.^[80]
Fungi
There are many species of fungi including lichen-forming species, and the mycobiota is less poorly known than in many other parts of the world. The most recent checklist of Basidiomycota (bracket fungi, jelly fungi, mushrooms and toadstools, puffballs, rusts and smuts), published in 2005, accepts over 3600 species.^[81] The most recent checklist of Ascomycota (cup fungi and their allies, including most lichen-forming fungi), published in 1985, accepts another 5100 species.^[82] These two lists did not include conidial fungi (fungi mostly with affinities in the Ascomycota but known only in their asexual state) or any of the other main fungal groups (Chytridiomycota, Glomeromycota and Zygomycota). The number of fungal species known very probably exceeds 10,000. There is widespread agreement among mycologists that many others are yet to be discovered.
Demographics
Main article: Demographics of the United Kingdom