| 单词 | 鸟类 |
| 释义 | 鸟类 “The smaller the bird, the more viscous the air is,” he said, which is partly why hummingbirds can maneuver so well and for so long. Birds, reptiles and insects come from eggs. From a psychological point then, animals have evolved to be nice to their kin, particularly their children, and particularly in birds and mammals. About160 species of rare birds live in the swamps and prairie there. But birds or the wind can reintroduce them to the land. When we think of species we tend to think of mammals or birds, which are pretty well known. It's one of the most important for understanding the origin of birds. And not only birds. With illnesses like the flu, on the other hand, the virus that causes it mutates a lot and can live in a number of different organisms, including humans, pigs and birds, he said. Cats prey on birds and mice. New flu vaccines need to be made each season because the viruses are constantly changing so as to avoid attack by host immune defences— whether in birds, humans or other animals. Well, some birds may have the same idea. But moths survive by being camouflaged, and ladybugs survive by being conspicuous and telling birds not to eat them. First off, birds hardly use their noses; instead they rely on their eyes and ears. Raising chickens or other birds for their eggs and meat is a popular family and business activity almost everywhere in the world. He cautions that other birds have been assumed to be extinct, only to be rediscovered later. He was busy gathering information about birds. They learned it from the birds. They have found that family traits are key to identifying why certain birds thrive in European cities. How will it change our view of the origin of birds? By turns angelic in flight and stately in tucked-in repose, it is elegance on the wing— a bird to inspire flights of fancy. Big extinct birds such as the giant moa, thunderbirds and elephant birds all left eggshells behind them. In the woods many birds nest. Wildlife, insects, frogs, birds, and soil organisms are able to play their roles in the tapestry of ecology, and we are able to play ours, without interference or compromise. And, for reasons as yet undiscovered, the embryonic neck- skin of birds produces more retinoic acid than the embryonic skin from any other part of their bodies. Given how evolution proceeds, birds should have the same fingers as their dino ancestors, but that's not what some researchers have found. |
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