The mammals of Shetland are comparatively few. There are no deer, foxes or badgers. Rats and mice are numerous, hedgehogs are fairly common. Moles and bats are unknown. So, too, are snakes, lizards, frogs and toads. The weasel is found in many districts, and its near relative, the ferret, is used for hunting rabbits, which are plentiful everywhere. Hares were imported some time ago, but have a hard struggle for existence with so many enemies around. Along the shore may occasionally be seen the sea-otter, when he comes up on a rock to enjoy a feast of sea-trout, or to venture inland in search of fresh water. He must needs be wary, as he is greatly sought after for the sake of his valuable skin. Another amphibian is the seal, whose habitat is the base of inaccessible cliffs and out-lying rocks and isles.

The birds of Shetland may be divided into residents, summer visitors, and winter visitors. In the great annual migrations which take place in spring and again in autumn, the islands form a resting-place for the feathered voyagers, some of whom stay to nest. Sea fowl naturally predominate. The gull family is the most numerous and includes the great black-backed gull, the lesser black-back, the herring gull, the common gull, the black-headed gull and the pretty kittiwake. Shags (scarfs) and cormorants are abundant all the year round; and in their season come the guillemots, razorbills, puffins, manx shearwaters and little auks. The guillemots congregate in thousands on the rocky ledges of cliffs, where each female lays a solitary egg on the bare rock. The egg is so formed that, even if disturbed, it will not roll off the shelf on which it lies. The plumage of the black guillemot or “tystie” during the winter season is of a mottled-grey colour, and the bird is difficult to recognise in its changed appearance. Eider ducks are abundant, and the great northern diver (emmer goose) may often be seen.

Colonies of fulmar petrels are spreading all round the coast, while the stormy petrel comes to nest in the outer islands. The piratical skua is common; and the great skua, which is strictly protected, is on the increase in certain localities. Among the shore birds may be mentioned the noisy terns and oyster-catchers. In the winter come the turnstones, sandpipers, dunlins and redshanks. Among the divers may be noted the golden-eye, merganser, and long-tailed duck, while the stock-duck, teal and widgeon are fairly plentiful.

Wild geese and swans, and flocks of rooks occasionally rest on their journey, but the rooks, though numerous elsewhere in Britain, do not take up residence in Shetland longer than they can help. Ravens and hooded-crows are plentiful. The peregrine falcon, the merlin, the kestrel and the lordly sea-eagle are among the birds of prey. Of game birds, the ringed plover, curlew, snipe, golden plover and rock pigeons are common, while woodcock make their appearance during the migratory flight in autumn.

Starlings, sparrows and linnets are plentiful; and owing to the almost entire absence of other songsters, the song of the skylark is more noticeable. Among summer visitors may be mentioned the wheat-ear, landrail and peewit, while swallows and martins may be seen occasionally. Winter visitors include fieldfares, buntings, redwings, robin redbreasts, blackbirds, thrushes and the smallest of all British birds, the golden-crested wren. The tiny wren, misnamed the “robin,” with its cheery song and hide-and-seek ways among the rocks, stays all the year round, as do also the rock and meadow pipits.

Absence of trees and hedgerows, and the general bareness of the ground, bring into prominence the different varieties of wild flowers. On the moors and hillsides grow the crisp heather and heath, with occasional patches of crowberry, while peeping out among these are the milk-wort, the butter-wort and bog asphodel, with the downy cotton-grass in damp places. The pretty yellow tormentil is everywhere among the stunted grass. The spotted orchis, the yellow buttercup and the lovely grass of Parnassus are also conspicuous on the grassy uplands. In meadow lands and marshy places are found the purple orchis, marsh-marigold, marsh cinquefoil, lady’s smock, ragged robin, and red and yellow rattle, while in ditches may be seen different varieties of the crow-foot tribe and scorpion grass (forget-me-nots). On dry banks may be found the scented thyme, white and yellow bed-straws, and near by, the bird’s foot trefoil. Daisies, scentless Mayweed and eyebrights are everywhere. In some corn-lands the red poppy shines forth; while the wild mustard and radish (runchie) are only too common. Growing in the cliffs are rose-root, scurvy grass and sea-campions (misnamed sweet-william). The vernal squill, hawk-weed and sheep’s scabious spangle the green pasture, and sea-pinks are all round the shore, extending in some places to the water’s edge. The mountain-ash, the wild rose and the honeysuckle grow in sheltered nooks.