识别棕熊的一种方法是通过肩膀顶部的驼峰。由肌肉制成的驼峰被认为使熊更容易挖掘巢穴。没有其他现存的熊有这种驼峰。成年熊有短尾和锋利的牙齿,弯曲的下犬齿。他们的头骨沉重而凹陷。棕熊的范围包括北美北部和欧亚大陆,包括美国,加拿大,俄罗斯,中国,中亚,斯堪的纳维亚半岛,罗马尼亚,高加索和安纳托利亚。有一段时间,它也遍布整个欧洲,北非,以及北美的墨西哥。棕熊的爪子很大,弯曲,钝。他们的爪比黑熊更直,更长。与容易爬树的黑熊不同,由于其重量和爪状结构,棕熊的爬行频率较低。棕熊的大小变化很大,取决于亚种和食物供应。男性比女性大约30%。平均大小的熊的长度可能在5到8英尺之间,重700磅,然而,更小和更大的标本出现。平均而言,北极熊比棕熊大,但是大灰熊和北极熊相当。您可能会从他们的名字中猜出棕熊是棕色的。然而,这些熊可以是棕色,红色,棕褐色,奶油色,双色或近黑色。有时它们的毛皮尖端是有色的。毛皮长度根据季节而变化。在夏天,他们的皮毛更短。在冬季,一些棕熊的毛皮长度可达4至5英寸。棕熊栖息在各种各样的环境中。它们被记录在海拔到5000米(16000英尺)的海拔高度。他们居住在温度较高的森林中,喜欢半开放的地区,但也生活在苔原,草原和河口。生活在人们附近的熊可能会捕食宠物和牲畜,并清除人类的食物。棕熊在秋季每天吃掉多达90磅的食物,其重量是春季从窝里出来的两倍。成年棕熊面对很少的食肉动物。根据他们居住的地方,他们可能会被老虎或其他熊袭击。棕熊主宰灰狼,美洲狮,黑熊甚至北极熊。大型食草动物很少威胁熊,但可能致命伤害一只自卫或保护小牛。虽然棕熊有着凶猛的食肉动物的美誉,但它们实际上可以从植被中获得高达90%的卡路里。熊是杂食性的,自然好奇吃几乎任何生物。他们喜欢的食物是丰富且容易获得的,根据季节而变化。他们的饮食包括草,浆果,根,腐肉,肉,鱼,昆虫,坚果,花,真菌,苔藓,甚至松果。

新西兰奥克兰大学生物学Essay代写:棕熊的有趣事实

One way to identify a brown bear is by the hump at the top of its shoulder. The hump, which is made of muscle, is believed to make it easier for the bear to dig a den. No other extant species of bear has this hump. Adult bears have short tails and sharp teeth with curved lower canines. Their skulls are heavy and concave. The brown bear’s range includes northern North America and Eurasia, including the United States, Canada, Russia, China, Central Asia, Scandinavia, Romania, Caucasus, and Anatolia. At one time, it was also found throughout Europe, in northern Africa, and as far south as Mexico in North America. Brown bears’ claws are large, curved, and blunt. Their claws are straighter and longer than those of black bears. Unlike the black bear, which readily climbs trees, the brown bear climbs less frequently due to its weight and claw structure. Brown bear size is highly variable, depending both on subspecies and food availability. Males are about 30% larger than females. An average-sized bear might range from 5 to 8 feet in length and weigh 700 pounds, however, much smaller and much larger specimens occur. On average, polar bears are larger than brown bears, but a large grizzly and a polar bear are comparable. You might guess from their name that brown bears are brown. However, these bears can be brown, red, tan, cream, bicolored, or nearly black. Sometimes the tips of their fur are colored. Fur length varies according to the season. In the summer, their fur is shorter. In the winter, some brown bears’ fur can reach 4 to 5 inches in length. Brown bears inhabit a wide range of environments. They have been recorded living at altitudes ranging from sea level to 5000 m (16000 ft). They inhabit temperature forests, preferring semi-open regions, but also live on the tundra, prairies, and estuaries. Bears that live near people may prey on pets and livestock and scavenge for human food. Brown bears eat up to 90 pounds of food per day in autumn and weigh twice as much as when they emerge from their dens in the spring. Adult brown bears face few predators. Depending where they live, they may be attacked by tigers or other bears. Brown bears dominate gray wolves, cougars, black bears, and even polar bears. Large herbivores rarely threaten the bears, but may fatally wound one in self-defense or protecting calves. Although brown bears have a reputation as fierce carnivores, they actually obtain as much as 90% of their calories from vegetation. Bears are omnivorous and naturally curious about eating nearly any creature. Their preferred food is anything abundant and easy to obtain, which varies according to the season. Their diet includes grass, berries, roots, carrion, meat, fish, insects, nuts, flowers, fungi, moss, and even pine cones.

发表评论

电子邮件地址不会被公开。 必填项已用*标注