across the globe, billions of birds take flight on (Earth-bound) migrations. From hundreds to thousands of miles in length, these seasonal journeys keep the beat of the natural world–heralding annual cycles andtransporting nutrients and biodiversityfar and wide. But why do birds go through all...
into hibernation when it drops to around 50.(5)___ This is when female mosquitoes start looking for a place for sleep.A.The obvious answer is that it's cold.B.Now it's time for male mosquitoes to wake up.C.It's only the female mosquitoes that are biting you.D.Unlike birds,mosquit...
这意味着他们前往其他地方的天气是温暖的或他们能找到的食物。 Many birds migrate in the fall. Because the trip can be dangerous, some travel in large flocks. For example, geese fly in noisy, "V"-shaped groups. Other kinds of birds fly alone.许多鸟儿秋天迁徙。因为这次旅行是很危险的,大群一些...
D. Birds(3)The arctic fox turns the colour of his coat into___in winter.A. whiteB. brownC. pinkD. black(4)The underlined word "hibernation" probably means ___ in the passage.A.迁徙B.繁殖C.冬眠D.灭绝(5)What is the main idea of this passage?A. Animals do funny and interesting...
Though they don’t go into traditional hibernation, they decrease running and other activities as well as eat less during the dry season. Diet These lizards are carnivores eating the food source that is most abundant in their tropical habitat. What Eats Frilled Lizards? Birds of prey such as ...
Many birds migrate in autumn. Some fly in large groups, because the trip can be dangerous.2.. Some animals remain active in winter. They must get used to the changing weather.3.To keep warm, animals may grow new, thicker fur in autumn. ...
根据文章第一段“A new study finds that reptiles (爬行动物) and birds do something that is similar to hibernation, but a little different. In very cold weather, their body temperatures greatly drop into an energy-saving state in order to survive. The ability to thermoregulation (体温调节) for...
Are frogs cold-blooded? Like other amphibians, frogs and toads arecold-blooded. This means their body temperatures change to match the temperatures of their environment. When winter comes around, frogs and toads go into a state of hibernation....
It actually doesn't have to be what we humans would consider "cold" to put a mosquito in danger. While these pests live actively when it's around 80 degrees F, most species can start heading into hibernation when ...
Would you like to go to a warm place for the winter? That’s what migratory (迁徙的) animals do. When the weather starts to get cold, migratory animals like some birds and butterflies fly to a warmer place, and then they come back in spring. Another good way to ...