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Tusks are generally curved and have a smooth, continuous surface. The male narwhal's straight single helical tusk, which usually grows out from the left of the mouth, is an exception to the typical features of tusks described above. Continuous growth of tusks is enabled by formative tissues in the apical openings of the roots of the teeth. [2] [3]
Giraffidae: Giraffids have a pair of skin covered bony bumps on their heads, called ossicones. Cervidae: Most deer have antlers, which are not true horns due to lacking a bone core and made of keratin. Rhinocerotidae: The "horns" of rhinos are made of keratin and lack a bone core.
Macrotis means 'big-eared' (macro-+ ōt-'ear') in Greek, referring to the animal's large, long ears. [4] The genus name was first proposed as a subgeneric classification, which after a century of taxonomic confusion was eventually stabilised as the accepted name in a 1932 revision by Ellis Troughton. In reviewing the systematic arrangement of ...
Most species have a rich mane of long hair running from the withers or from the head. [30] With the exception of the spotted hyena, hyaenids have striped coats, which they likely inherited from their viverrid ancestors. [7] Their ears are large and have simple basal ridges and no marginal bursa. [31]
Elephants have giant, floppy ears because they regulate body Alongside their long trunks, an elephant’s big ears are the first thing we see. These large ears easily give elephants a commanding ...
It has a long neck, and large, flexible ears. Its coat is a chocolate to reddish brown, much in contrast with the white horizontal stripes and rings on the legs, and white ankles. Male okapis have short, distinct horn-like protuberances on their heads called ossicones , less than 15 cm (5.9 in) in length.
The canine teeth are usually large, conical, thick and stress resistant. All of the terrestrial species of carnivorans have three incisors on each side of each jaw (the exception is the sea otter (Enhydra lutris) which only has two lower incisor teeth). [57] The third molar has been lost. The carnassial pair is made up of the fourth upper ...
Asian males can have tusks as long as Africans', but they are usually slimmer and lighter; the largest recorded was 302 cm (9 ft 11 in) long and weighed 39 kg (86 lb). Hunting for elephant ivory in Africa [58] and Asia [59] has resulted in an effective selection pressure for shorter tusks [60] [61] and tusklessness. [62] [63]