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The uakari (Cacajao rubicundus) is a monkey found in tree tops in swamp forests in the upper Amazon. South America. There are three species: the bald, the black-headed and the red-faced all distinguished by a short tail. Its powerful jaws are capable of cracking Brazil nuts, which together with other nuts, fruits, plants, insects and grubs comprise its diet.
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The Ukranian Riding Horse is a Ukranian breed of riding horse developed at the end of the Second World War as an all-round sports horse. The Ukranian Riding Horse stands between 15.1 and 16.1 hands high and is bay, brown or black in colour.
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Ulex is a small genus of hardy, spiny spring shrubs belonging to the family Leguminosae. They are natives of western Europe and north-west Africa and bear yellow flowers either solitary or showily racemose. As seedlings they have a few normal leaves divided into three leaflets; but later leaves are all metamorphosed into needle-pointed spines. The larger spines are abortive shoots, as is shown by many of them bearing flowers. A common British variety is the Gorse.
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Ulmaceae is the elm order of trees and shrubs, natives chiefly of the northern regions. They have rough, alternate leaves, and greenish flowers in loose clusters. The family is divided into two sub-orders, Celtidae and Ulmeae. The elms are ,ostly very large trees with rough bark; the timber being long valued for its resistance to water.
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An umbel is an inflorescence in which all the flowers are borne upon pedicels of equal length arising from a common centre. The arrangement is characteristic of the Umbelliferae family.
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The Umbelliferae is a family of mostly herbaceous hardy plants which generally have flowers in regular compound umbels of small flowers with five petals and fistula furrowed stems. The fruit is composed of two dry, ridged carpels, often traversed by canals filled with pungent oils, and adherent to a central stalk,. They have jointed stems, the lengths between the nodes being usually hollow. The alternate leaves are occassionaly undivided, but mostly much dissected, the leaf stalk dilated at the base and clasping the stem.
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The Umbrella Tree (Magnolia umbrella) is a small tree of the natural order Magnoliaceae native to North America. The Umbrella Tree has oval-lance shaped leaves thirty to sixty centimetres long, crowded at the summit of the flowering branches in an umbrella-like circle. The flowers are large, white and slightly scented.
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The umbrette (Scopus umbretta) or hammer-head is a bird found in Madagascar and parts of Africa. The general colour is purplish brown, and the head bears a large erectile crest.
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Ungulata is an order of the mammalia, which includes all the hoofed forms, as the cattle, sheep, antelopes, giraffes, deer, camels, llamas, pigs, hippopotami, rhinoceroses, horses, hyrax, and elephants. In these the limbs have completely lost the power of grasping, and the feet are adapted for running only, the toes being protected by an external casing of horny substance known as a hoof. The number of the toes tends to undergo reduction, as in the rhinoceros, which has three, and the horse, which has only one. From this feature, the ungulates are divided into two groups. The Perissodactyla, or odd-toed ungulates, include the horse, elephant, etc. while the Artiodactyla, or even-toed ungulates, include the cattle, deer, sheep, etc. It is among the ungulates that the function of ruminating or chewing the cud is developed.
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Unionidae is the Fresh-Warerr Mussels family of bivalve molluscs. The two valves of the shell are equal and sometimes very thick, with pearly inner lining, the foot large and thick, and the byssus or attaching threads absent. They occur in rivers and lakes in all parts of the world. In Great Britain four species occur ; Unio tumidus and Unio pictorum in the rivers of southern England. The pearl mussel, Unio margaritiferus, which occurs in the mountain streams of Scotland and Ireland, was formerly the source of an important industry. Anodonta cyqnea ia the swan mussel found in large ponds.
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Unkindness is the collective noun for a group of ravens.
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The upas (Antiaris toxicaria) is a tree of the family Urticaceae, allied to the fig, hop and nettle, found in Java and exuding a milky white juice called antiarin which is allied to strychnia. The milky juice that exudes from the incised bark is extremely virulent and is used for poisoning arrows. On the basis of this single fact a mass of legend was built up, as, for example, the story that nothing could live within a considerable radius ten or twelve miles of the tree, so virulent was its effluvia.
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Urchin of the woods (Hydnum repandum) is an edible pale yellow fungus found in groups in woods in autumn.
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Urd (Gram, Black gram, Vigna mungo) is a plant of the family Leguminosae cultivated in tropical Asia for its edible seeds and as forage.
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The Urial or Oorial (Ovis Vignei) is a wild sheep of Asia. It occurs from the Punjab through Afghanistan to eastern Iraq. The rams have a characteristic ruff of long hair on the throat and the horns curve round in a circle, while the horns of the ewe are very short and nearly straight.
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Urochordata is a class of sub-Phylum Acrania. They are the sea squirts. They are ciliary-feeding marine animals.
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The urodela are a subclass of amphibia. They are the newts and salamanders. The tail persists throughout life. The fore and hind limbs are poorly developed.
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Urodon is a genus of Seed Beetles (Bruchidae).
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The Uromastix are a genus of approximately 13 species of lizards, related to the iguana, whose members are found in arid regions from north-western India throughout south-western Asia and the Arabian Peninsula to the Sahara of Africa Asia and Africa. The tail is covered with spiny scales. The members of the genus are popularly called dab lizards or spiny tailed lizards.
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Uropeltidae is the 'Shieldtail Snakes' family of reptiles of the suborder Serpentes (Snakes). The members are mainly small burrowing snakes of between 20 and 50 centimetres length, with a cylindrical body covered in smooth scales, making up some 44 species in eight genera. They are found only in the southern part of India and in Sri Lanka.
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Urticaceaeis a family of exogenous trees, herbs and shrubs. This is the nettle family, with stinging hairs.
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The urus (Bos taurus) was the ancient wild ox of Europe, the ancestor of the existing domesticated forms.
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Usnea is a genus of gymnocarpous parmeliaceous lichens, with subterminal pelate apothecia, usually of a grey colour, found hanging on trees, and popularly known as tree-mosses or beard-mosses.
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The Utah Milk Snake (Lampropeltis triangulum taylori) is a species of Milk Snake first described in 1957 and distinguished by a snout that is almost always entirely black and a ring count of between 23 and thirty-four. Little is known about the lifestyle of the Utah Milk Snake, except that it seems to like to spend a lot of time underground.
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The Utah Mountain Kingsnake (Lampropeltis pyromelana infralabialis) is a subspecies of the Sonoran Mountain Kingsnake distinguished by a white snout on a black coloured head. The Utah Mountain Kingsnake occurs in Utah, Arizona and Nevada and grows to about 102 centimetres long.
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Utricularia is a genus of herbaceous plants belonging to the family Lenticulariaceae. They bear flowers with two equal sepals and a spurred corolla.
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