马和驴子的区别从小时候一直没弄懂的问题

马和驴子的区别
从小时候一直没弄懂的问题

骡
维基百科,自由的百科全书
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A barren of mules.骡正在翻译.欢迎您积极翻译与修订.
骡子是马和驴的杂交种.公马和母驴的基因更容易结合,所以大部分骡都是这样杂交的.不过基因结合的几率还是很小：有的马用了6年时间才成功的交配并弄到驴子怀孕.公骡子和大部分母骡子生出来是没有生殖能力.没有生殖能力是因为染色体不成对（63个）,生殖细胞无法进行正常的分裂（即减数分裂）.母骡有性功能,子宫可以可以怀胚胎,但是最困难的地方是使母驴怀孕.
目录 [隐藏]
1 主要特征
2 History
3 分类
4 习性
5 食性
6 寿命
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主要特征
体型比马大,比驴大,耳比马长,比驴短.大多数黑色,臀高约1.55米. In its short thick head, long ears, thin limbs, small narrow hooves, short mane, absence of chestnuts (horny growths) inside the hocks, and tail hairless at the root, the mule appears asinine in form. In height and body, shape of neck and croup, uniformity of coat, and teeth, it appears equine. Also characteristic of the mule is its enormous phallus, hence the popular colloquial expression. It has the voice neither of the ass nor of the horse, but emits a feeble hoarse noise. Most mules have a brown or bay-brown coat — bay, or bright bay, or piebald occur rarely; a chestnut tint sometimes appears.
The mule possesses the sobriety, patience, endurance and sure-footedness of the ass, and the vigour, strength and courage of the horse. Operators of beasts of burden generally find mules preferable to horses: mules show less impatience under the pressure of heavy weights, while their skin, harder and less sensitive than that of horses, renders them more capable of resisting sun and rain.
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History
Humans have used mules from early times; the inhabitants of Mysia and Paphlagonia allegedly bred the first mules. The ancient Greeks and especially Romans valued mules for transport, employing them to draw carriages and carry loads. Mules hauled barges in the early days of the Erie Canal. In the early 20th century use of mules survived mainly in military transport, being used to haul caissons and artillery through nearly impassable terrain, the bravery and focused intelligence of the animal serving it well in the midst of the noise and confusion of warfare. Image:WH2004ruffing1.jpg Mules have become far less common since the rise of the automobile, the motorized tractor, and other internal combustion-powered vehicles. They still find employment in less-developed countries, and in certain specialized roles for which they are still aptly suited. Mules can negotiate well on narrow, steep trails — such as the route from the South Rim down into the Grand Canyon. (The animal used for tourist transport on the Bright Angel Trail in the Grand Canyon is the burro, a variety of donkey.) Mules (and burros) can handle extremely rugged terrain and tracks that are too steep and twisted for either the less sure-footed horse or for a motor vehicle. Mules are also shown at equine shows.
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分类
驴骡
马骡
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习性
性比马倔,比驴顺.
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食性
以草、树叶为食
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寿命
约50年
“骡”是未完成的生物小作品.欢迎您积极编辑或修订扩充其内容.
马和驴杂交,生的是骡子,骡子不能繁殖自己的后代,不分公母!