Buck Pronghorn, Pine Forest Range, Northwest Nevada : 無料・フリー素材/写真
Buck Pronghorn, Pine Forest Range, Northwest Nevada / Ken Lund
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | The pronghorn, Antilocapra americana, is a species of artiodactyl mammal indigenous to interior western and central North America. Though not an antelope, it is often known colloquially in North America as the prong buck, pronghorn antelope, cabri (native American) or simply antelope because it closely resembles the true antelopes of the Old World and fills a similar ecological niche due to convergent evolution.Pronghorns have distinct white fur on their rumps, sides, breasts, bellies, and across their throats. They have a highly developed sense of curiosity compared to related animals. Adult males are 1.3–1.5 m (4 ft 3 in–4 ft 11 in) long from nose to tail, stand 81–104 cm (32–41 in) high at the shoulder, and weigh 40–65 kg (88–143 lb). The females are the same height as males, but weigh 34–48 kg (75–106 lb). The feet have just two hooves, with no dewclaws. Their body temperature is 38°C (100°F).Each "horn" of the pronghorn is composed of a slender, laterally flattened blade of bone that grows from the frontal bones of the skull, forming a permanent core. As in the Giraffidae, skin covers the bony cores, but in the pronghorn it develops into a keratinous sheath which is shed and regrown on an annual basis. Unlike the horns of the family Bovidae, the horn sheaths of the pronghorn are branched, each sheath possessing a forward-pointing tine (hence the name pronghorn). Males have a horn sheath about 12.5–43 cm (4.9–16.9 in) (average 25 cm (9.8 in)) long with a prong. Females have smaller horns that range from 2.5–15.2 cm (1–6 in) (average 12 centimetres (4.7 in)) and sometimes barely visible; they are straight and very rarely pronged. Males are further differentiated from females in having a small patch of black hair at the angle of the mandible.en.wikipedia.org/wiki/Pronghornen.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_... |
| 撮影日 | 2008-06-14 08:15:14 |
| 撮影者 | Ken Lund , Reno, Nevada, USA |
| タグ | |
| 撮影地 | Nevada, United States 地図 |
| カメラ | Canon PowerShot A540 , Canon |
| 露出 | 0.001 sec (1/800) |
| 開放F値 | f/4.0 |
| 焦点距離 | 12515.55556 dpi |