Loxodonta africana (African bush elephants) (Maasai Mara National Reserve, Kenya) 9 : 無料・フリー素材/写真
Loxodonta africana (African bush elephants) (Maasai Mara National Reserve, Kenya) 9 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Loxodonta africana (Blumenbach, 1797) - African bush elephants in Kenya. (photo provided by Miranda Manross)Mammals are the dominant group of terrestrial vertebrates on Earth today. The group is defined based on a combination of features: endothermic (= warm-blooded), air-breathing, body hair, mother's milk, four-chambered heart, large brain-to-body mass ratio, two teeth generations, differentiated dentition, and a single lower jawbone. Almost all modern mammals have live birth - exceptions are the duck-billed platypus and the echidna, both of which lay eggs.Mammals first appear in the Triassic fossil record - they evolved from the therapsids (mammal-like reptiles). Mammals were mostly small and a minor component of terrestrial ecosystems during the Mesozoic. After the Cretaceous-Tertiary mass extinction at 65 million years ago, the mammals underwent a significant adaptive radiation - most modern mammal groups first appeared during this radiation in the early Cenozoic (Paleocene and Eocene).Three groups of mammals exist in the Holocene - placentals, marsupials, and monotremes. Other groups, now extinct, were present during the Mesozoic.Loxodonta africana, the African bush elephant, is native to parts of Africa - principally central Africa, eastern Africa, and southern Africa.Classification: Animalia, Chordata, Vertebrata, Mammalia, Proboscidea, ElephantidaeLocality: Maasai Mara National Reserve, southwestern Kenya--------------------------------Info. at:en.wikipedia.org/wiki/African_bush_elephant |
| 撮影日 | 2022-05-22 00:08:27 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |