Acacia — Acacia is a genus of shrubs and trees belonging to the subfamily Mimosoideae of the family Fabaceae, first described in Africa by the Swedish botanist Carolus Linnaeus in 1773. Acacias are also known as thorntrees or wattles, including the yellow-fever acacia and umbrella acacias. There are roughly 1300 species of Acacia worldwide, about 960 of them native to …

Wombat — Wombats are Australian marsupials; they are short-legged, muscular quadrupeds, approximately one metre (3 feet) in length with a very short tail. The name wombat comes from the Eora Aboriginal community who were the original inhabitants of the Sydney area. They are found in forested, mountainous, and heathland areas of south-eastern Australia and Tasmania. Wombats dig extensive burrow systems …

Wolverine — The wolverine (Gulo gulo) is the largest land-dwelling species of the Mustelidae or weasel family (the Giant Otter is largest overall), and is the only species currently classified in the genus Gulo (meaning “glutton”). It is also called the Glutton or Carcajou. Some authors recognize two subspecies: the Old World form Gulo gulo gulo and the New World …

Wolf — The gray wolf (Canis lupus), also known as the timber wolf or wolf, is a mammal of the order Carnivora. The gray wolf is the largest wild member of the Canidae family and an ice age survivor originating during the Late Pleistocene around 300,000 years ago. Its shoulder height ranging from 0.6 to 0.9 meters (26-36 inches) and …

Wildebeest — The wildebeest, is an antelope of the genus Connochaetes. It is a hooved (ungulate) mammal. Connochaetes includes two species, both native to Africa: the Black Wildebeest, or white-tailed gnu (C. gnou), and the Blue Wildebeest, or brindled gnu (C. taurinus). Gnus belong to the family Bovidae, which includes antelopes, cattle, goats, and other even-toed horned ungulates. Wildebeest grow …

Wildcat — The Wildcat (Felis silvestris), sometimes Wild Cat or Wild-cat, is a small felid native to Europe, the western part of Asia, and Africa. It is a hunter of small mammals, birds, and other creatures of a similar size. There are several subspecies distributed in different regions. Sometimes included is the ubiquitous domestic cat (Felis silvestris catus), which has …

Whale — According to modern terminology, whales are the larger members of the order Cetacea. This order of aquatic mammals is divided into three suborders: the Mysticeti, the baleen whales; the Odontoceti, the toothed whales; and the Archaeoceti, an extinct group known only through fossils. The toothed whales (Odontoceti) also include the smaller DOLPHIN and PORPOISE. The large baleen whales …

Weasel — Weasels are mammals in the genus Mustela of the Mustelidae family. Originally, the name “weasel” was applied to one species of the genus, the European form of the Least Weasel (Mustela nivalis). Early literary references to weasels, for example their common appearances in fables, refer to this species rather than to the genus as a whole, reflecting what …

Warthog — The Warthog (Phacochoerus africanus) (“African Lens-Pig”) is a wild member of the pig family that lives in Africa. The common name comes from the four large wart-like tusks found on the head of the warthog, which serve the purpose of defense when males fight. They are the only widely recognised species in their genus, though some authors divide …

Wapiti — The elk, or wapiti (Cervus canadensis), is the second largest species of deer in the world and one of the largest mammals in North America and eastern Asia. In the deer family (Cervidae), only the moose, Alces alces (called an “elk” in Europe), is larger. Wapiti are almost identical to red deer found in Europe, of which they …