Female sheep are calledewes, males are calledrams or less frequentlybucks ortups, neutered males are calledwethers, and young sheep are calledlambs. The adjective applying to sheep isovine, and the collective term for sheep isflock ormob. The termherd is also occasionally used in this sense, generally for large flocks. Manyspecialist terms relating to domestic sheep are used.
Sheep are fairly small compared to otherungulates; in most species, adults weigh less than 100 kg (220 lb).[2] Males are usually heavier than females by a significant amount. Wild sheep are mostly found in hilly or mountainous habitats. Their diets consist mainly ofgrasses, as well as other plants andlichens. Like otherruminants, they have four-chamberedstomachs, which play a vital role indigesting food; theyeructate, and rechew thecud to enable them to digest and live on low-quality, rough plant materials. Sheep conserve water well, and can live in fairly dry environments.
The bodies of wild sheep (and some domestic breeds) are covered by a coat of thickhair to protect them from cold. This coat contains long, stiff hairs, called kemps, over a short, woolly undercoat, which grows in autumn and is shed in spring.[3] This woolly undercoat has been developed in many domestic sheep breeds into a fleece of longwool, with selection against kemp hairs in these breeds. The fleece covers the body (in a few breeds also the face and legs) and is used forfibre. Domestic sheep are also reared for theirmilk andmeat (which is calledlamb or mutton depending on the age of the animal).
In wild sheep, both rams and ewes havehorns, while in domestic sheep (depending uponbreed) horns may be present in both rams and ewes, in rams only, or in neither. Rams' horns may be very large – those of a mature bighorn ram can weigh 14 kg (31 lb) – as much as the bones of the rest of its body put together. Rams use their horns to fight with each other for dominance and the right to mate with females. In most cases, they do not injure each other because they hit each other head-to-head, and their curved horns do not strike each other's bodies. They are also protected by having very thick skin and double-layered skulls.[4]
Wild sheep have very keensenses ofsight andhearing. When detecting predators, wild sheep most often flee, usually to higher ground, but they can also fight back. The Dall sheep has been known to buttwolves off the face of cliffs.[4]
Sheep havescent glands on their faces and feet. Communication through the scent glands is not well understood, but is thought to be important for sexual signaling. Males can smell females that are inestrus, and ramsmark their territories by rubbing scent on rocks.
Sheep are social animals and live in groups, called flocks. This helps them to avoidpredators and stay warm in cold weather by huddling together. Flocks of sheep need to keep moving to find new grazing areas and more favourable weather as the seasons change. In each flock, a sheep, usually a mature ram, is followed by the others.[3] This "leader to follower" relationship can be both a positive and negative for flocks ofOvis aries. Although there is safety in numbers, it has been reported that the following of one mature ram can bring flocks to slaughter in many situations where the mature ram misguides the flock.[7][8]
Mating in sheep ischaracterized by males competing for females in estrus.[9]Social rank in rams is established by male-male competition during therutting period.[10] Females select from dominant males based on sexually selected characteristics such as body size and horn size, as those traits are desirable in offspring.
Females typically are separated from males outside the rut, but during the rut, females and males are found together.[10] Females that are oestrous isolate themselves from other ewes, and may be less mobile.[10] The rut is also linked with different ewe behaviour than during nonrutting periods.[10] These changes are characterized by decreased feeding, increased time observing their surroundings, and increased behaviour changes.[10] Ewes are also predicted to be slightly receptive to the displays of the rams.[10]
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