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A closeup of a rat tail. The characteristic long tail of most rodents is a feature that has been extensively studied in various rat species models, which suggest three primary functions of this structure: thermoregulation, [13] minor proprioception, and a nocifensive-mediated degloving response. [14]
The Polynesian rat, Pacific rat or little rat (Rattus exulans), or kiore, is the third most widespread species of rat in the world behind the brown rat and black rat.Contrary to its vernacular name, the Polynesian rat originated in Southeast Asia, and like its relatives has become widespread, migrating to most of Polynesia, including New Zealand, Easter Island, and Hawaii.
A working rat is any rat which is trained for specific tasks as a working animal. In many cases, working rats are domesticated brown rats . However, other species, notably the Gambian pouched rat , have also been trained to assist humans.
The olecranon process is a part of the ulna bone where muscles attach, and digging animals tend to have enlarged olecranon processes to provide a large surface for their large and powerful muscles to attach.
Kangaroo rats, small mostly nocturnal rodents of genus Dipodomys, are native to arid areas of western North America.The common name derives from their bipedal form. They hop in a manner similar to the much larger kangaroo, but developed this mode of locomotion independently, like several other clades of rodents (e.g., dipodids and hopping mice).
Opposed circular and longitudinal muscles enable peristaltic motion. The remaining animals, the great majority—comprising some 29 phyla and over a million species—form the Bilateria clade, which have a bilaterally symmetric body plan. The Bilateria are triploblastic, with three well-developed germ layers, and their tissues form distinct organs.
The Malayan field rat has a head-and-body length of 140 to 190 mm (5.5 to 7.5 in) and a tail 150 to 200 mm (6 to 8 in). It has a weight of between 55 and 150 g (2 and 5 oz). The ears are large and nearly naked. The fur is smooth and flattened, interspersed with short spines.
The tanezumi rat (Rattus tanezumi), also known as the Asian rat or Asian house rat, yellow-breasted or buff-breasted rat (Rattus flavipectus), is a species of rodent in the family Muridae. It is closely related to the black rat ( Rattus rattus ).