狐狸和乌鸦的故事简介
狐狸和乌鸦（寓言故事）主要内容：狐狸和乌鸦一天， 乌鸦得到了一块肉， 被狐狸看到了。狐狸很想从乌鸦嘴里得到那块肉。由于乌鸦在树枝上嘴里叼着肉， 狐狸没有办法在树下得到， 它眼珠一转：“亲爱的乌鸦， 您好吗？”没有回答。“亲爱的乌鸦， 您的孩子好吗？”乌鸦看了狐狸一眼， 还是没有回答。狐狸摇摇尾巴， “您的羽毛真漂亮， 比其它鸟都漂亮， 嗓子真好， 可以给我唱首歌吗？”乌鸦听了非常得意， 就唱了起来。可是刚一张嘴， 肉就掉了， 狐狸叼着肉便一溜烟地跑了。
北极狐的英文介绍
Arctic fox, also known as the polar fox, is a small fox native to cold Arctic regions of the Northern Hemisphere. It is common in all three tundra biomes. Although some authorities have suggested placing it in the genus Vulpes, it has long been considered the sole member of the genus Alopex. The Arctic fox has smaller, more rounded ears, a more rounded braincase, and a slightly shorter and broader muzzle than the red fox, Vulpes vulpes (Clutton-Brock et al. 1976). Its feet are furrier than those of other foxes. The Arctic fox occurs in two distinct colour morphs, “blue“ and “white“. Each colour phase also changes seasonally: “blue“ moults from chocolate brown in summer to lighter brown tinged with a blue sheen in winter, and “white“ is almost pure white in winter, and in summer grey to brownish-grey dorsally, and light grey to white below. Colour morphs are determined genetically at a single locus, white being recessive. The “blue“ morph comprises less than 1% of the population through most of its continental range, but this proportion increases westwards in Alaska, and on islands. In Greenland roughly half of Arctic foxes are of the blue morph, and in Iceland most of them are blue.The Arctic fox has evolved to live in the most frigid extremes on the planet. Among its adaptations for cold survival are its deep, thick fur, a system of countercurrent heat exchange in the circulation of paws to keep them from freezing, and a good supply of body fat. The fox has a low surface-area-to-volume ratio as evidenced by its generally rounded body shape, short muzzle and legs, and short, thick ears. Since less of its surface area is exposed to the cold, less heat escapes the body. Its furry paws allow it to walk on ice flows in search of food. It is also able to walk on top of snow and listen for the movements of prey underneath. It has the warmest fur of any mammal.Arctic foxes mate in early March to early April. The gestation period is 52 days. Litters tend to average seven pups but may be as many as fifteen. Both the mother and the father help to raise their young. The males leave the family and form their own groups and the females stay with the family.Arctic foxes will eat pretty much anything. Their prey includes voles, lemmings, hares, ground squirrels, and bird eggs. Foxes living on the coast also eat shellfish, sea urchins, dead seals and fish, beached whales, and nesting seabirds. In winter when food is scarce, they may follow a polar bear and after the bear makes a kill, eats and leaves, they will steal what ever scraps of meat are left. In winter, their light coat protects them from predators, esp. polar bears, by blending in to the white snow.Head-and-body length: 55 cm (21.7 in) (male); 53 cm (21 in) (female).Tail length: 31 cm (12.2 in) (male); 30 cm (11.8 in) (female)Shoulder height: 25-30 cm (9.9-11.8 in).Weight: 3.8 kg (8.2 lb) (male); 3.1 kg (6.7 lb) (female).
