In grazing rhinos ( Ceratotherium), the cheek teeth are hypsodont, but they are brachydont in the other genera. The canines and incisors are vestigial except for the lower incisors in Asian rhinos, which are developed into powerful slashing tusks. Rhinos have 24-34 teeth, mostly premolars and molars for grinding (dental formula 1-2/0-1, 0/1-1, 3-4/3-4, 3/3). There is a strongly developed occipital crest. The surface of the nasals where the horns sit is roughened. Nasal bones project forward freely and may extend beyond and above the Rhinos have an elongate skull, which is elevated posteriorly. Their thick skin is scantily-haired and wrinkled, furrowed or pleated, producing the appearance of riveted armor plates in some species. Rhinos have small eyes and fairly short but prominent and erect ears. Both hind and forefeet are mesaxonic with 3 digits each each digit with a small hoof. Tibia/fibula are only slightly moveable, but they are well-developed and separate. Rhinos have a broad chest and short, stumpy legs. The horns are dermal in origin they are very solid and are composed of compressed, fibrous keratin. Rhinos have massive bodies and a large head with 1-2 horns. All rhinos are generally restricted to areas where a daily trip to water is possible. Rhinoceroses generally inhabit savannahs, shrubby regions and dense forests, and the African species usually live in more open areas than do the Asiatic species. Three of these species are found in south-central Asia and the other two live in Africa south of the Sahara. They are represented by 5 species placed in 4 genera. The family Rhinoceroteridae contains living rhinoceroses.
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