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Antlers are considered one of the most exaggerated cases of male secondary sexual traits in the animal kingdom, [10] and grow faster than any other mammal bone. [11] Growth occurs at the tip, and is initially cartilage, which is later replaced by bone tissue. Once the antler has achieved its full size, the velvet is lost and the antler's bone dies.
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The species became extinct approximately 11,500 years ago, toward the end of the most recent ice age, as part of a mass extinction of large North American mammals. [ 7 ] [ 8 ] The first evidence of Cervalces scotti found in modern times was discovered at Big Bone Lick , Kentucky by William Clark , circa 1805.
The following other wikis use this file: Usage on bxr.wikipedia.org Ухаанта хүн; Usage on ca.wikipedia.org Ésser humà; Usage on es.wikipedia.org
The scientific name of the blackbuck Antilope cervicapra stems from the Latin word antalopus ("horned animal"). [2] [3] The specific name cervicapra is composed of the Latin words cervus ("deer") and capra ("she-goat").
DNA evidence supports this hypothesis, and the small modern hyraxes share numerous features with elephants, such as toenails, excellent hearing, sensitive pads on their feet, small tusks, good memory, higher brain functions compared with other similar mammals, and the shape of some of their bones.
The jugal bone is located on either side of the skull in the circumorbital region. It is the origin of several masticatory muscles in the skull. [1] The jugal and lacrimal bones are the only two remaining from the ancestral circumorbital series: the prefrontal, postfrontal, postorbital, jugal, and lacrimal bones.
In his 1817 work, Le Règne Animal, French zoologist Georges Cuvier combined evidence from comparative anatomy and palaeontology [3] to divide the animal kingdom into four body plans. Taking the central nervous system as the main organ system which controlled all the others, such as the circulatory and digestive systems, Cuvier distinguished ...