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The mouse should be perfectly tractable and free from any vice and not subject to fits or other similar ailments. A mouse with absence of whiskers, blind in one or both eyes, carrying external parasites, having a tumor, sore or legs with fur missing, suffering from any obvious disease or deformity or kinked tail shall be disqualified." [15]
The house mouse is best identified by the sharp notch in its upper front teeth. Skull of Mus musculus - MHNT. House mice have an adult body length (nose to base of tail) of 7.5–10 centimetres (3–4 in) and a tail length of 5–10 cm (2–4 in).
Peromyscus is a genus of rodents.They are commonly referred to as deer mice or deermice, not to be confused with the chevrotain or "mouse deer". They are New World mice only distantly related to the common house and laboratory mouse, Mus musculus.
Named for its pale-furred back and long hind limbs and feet, the pale kangaroo mouse is a large-headed rodent with fur-lined external cheek pouches. This species is bipedal, meaning that it generally moves around on its strong hind legs, hopping much like a kangaroo .
Algerian mouse, showing the paler underparts. The Algerian mouse closely resembles the house mouse in appearance, and can be most easily distinguished from that species by its shorter tail. It has brownish fur over most of the body, with distinct white or buff underparts.
While a dark kangaroo mouse has dark brown and black fur, a pale kangaroo mouse has a lighter, pale brown color. Both pale and dark Microdipodops species share the same features such as having wide eyes, long and silky fur, shorten forelegs, long hind legs, and a long, slim tail with fur at the end that is used for balance.
A brush-furred mouse was recorded to have lived for over 3 years in captivity. Allopatric speciation appears to have played an important role in shaping the evolution of this genus. Research conducted on the group suggests that isolated species exist a relatively short distance away from one another.
The brush mouse is medium-sized, with small ears and a long tail. It has yellowish-brown fur on the body, with slate grey under parts. The tail has only sparse hair for most of its length, but with a distinct brush-like tuft of hair at the tip (although the common name is, perhaps, more likely to come from brushy environment in which it lives).