Along the river banks of the Amazon and the Orinoco there lives a bird that swims before i

Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly, flies like a fat chicken, eats green leaves, has the stomach of a cow and has claws(爪)on its wings when young .They build their homes about 4.6m above the river ,an important feature(特征)for the safety of the young. It is called the hoatzin.
In appearance，the birds of both sexes look very much alike with brown on the back and cream and red on the underside .The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its nearest relatives are the common birds, cuckoos. Its most striking feature, though, is only found in the young.
Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip .Using these four claws ,together with the beak(喙),they can climb about in the bushes, looking very much like primitive birds must have done. When the young hoatzins have learned to fly, they lose their claws.
During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30 birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven birds for producing purposes.
【小题1】What is the text mainly about?A．Hoatzins in dry and rainy seasons.B．The relatives and enemies of hoatzins.C．Primitive birds and hoatzins of the Amazon.D．The appearance and living habits of hoatzins.【小题2】Young hoatzins are different from their parents in that ．A．they look like young cuckoosB．they have claws on the wingsC．they eat a lot like a cowD．they live on river banks【小题3】 What can we infer about primitive birds from the text?A．They had claws to help them climb.B．They could fly long distances.C．They had four wings like hoatzins.D．They had a head with long feathers on the top.【小题4】 Why do hoatzins collect together in smaller groups when the rainy season comes?A．To find more food.B．To protect themselves better.C．To keep themselves warm.D．To produce their young.D

(答案→)D 解析：【小题1】选D。考查文章主题大意。纵观全文，文章主要讲的是hoatzin麝雉，这种鸟类的外貌以及生活习性。【小题2】选B。根据第一段has claws(爪)on its wings when young,和第三段可知，hoatzin在幼年期是有爪子的，而长大学会飞之后就没有了。【小题3】选A。关键是primitive“原始的，早期的”的意思。第三段第二句话。【小题4】选D。最后一段最后一句话。

就是这个解释

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