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Answer:
ExplanatWhat makes a bird a bird?
The first thing most people notice about birds is that they can fly, but that is not what makes them unique. Bats, bugs, and butterflies also take to the air, and they aren’t birds. What makes birds different from every other kind of animal on earth are feathers. Feathers make it possible for birds to live a large part of their lives in the air. Feathers weigh very little, are strong (to survive long flights), and provide terrific insulation (which is why people living in the coldest parts of the world prefer jackets stuffed with goose down). Most birds also have hollow bones. If bird bones were solid, like human bones, birds would be too heavy, which would make flight very difficult.
How do birds fly?
The simple answer is: with their wings. A more accurate answer is that everything about a bird’s body is designed for flight, including its specialized feathers, hollow bones, and very strong flight muscles located in the breast. As a bird flaps its wings, the force of the wings does two things: lifts and propels the bird. As the wings push downward and backward, more air is moved below the wing than above it. This difference in the amount of air, or air pressure, is what causes lift, and results in upward and forward movement of the bird.
The concept of lift, such as that produced by a bird’s wing, can be illustrated easily. Hold your hand, flattened with fingers together, just outside the window of a moving car. When the leading edge of the hand tilted upward, the force of the wind immediately pushes the hand upward. This is exactly how the aerodynamic design of a bird’s wing helps to create life and helps to hold a bird in the air in between flaps or while gliding.
How fast do birds fly?
Although they seem very fast to us, most birds do not fly more than 30 or 40 miles per hour at top speed. In general, small birds fly slower, and big birds fly faster. Birds as small as sparrows probably fly less than 20 miles per hour while some of the hawks fly as much as 50 or 60 miles per hour. We don’t know much about how fast birds fly because it is very hard to measure. Improvements in technologies such as radar will probably allow us to answer some of these questions in the future.
Do birds fly at night?
Most birds can fly at night, but will only do so if necessary. The reason for this is that their eyes, like human eyes, are not designed to see in nighttime conditions. If a bird cannot see well, it risks injury by flying at night. Unless startled into flight by a predator, most birds will avoid leaving their nighttime roost.
Other species, such as owls and nightjars (nighthawks and whippoor-wills) fly primarily at night, their most active time, and sleep during the day. Songbirds, such as warblers and tanagers, which are active during daylight hours, do fly at night during migration, when they must travel long distances. It is thought that these migrants fly at night because the air is cooler, so there is less chance of their overheating during the long, strenuous periods of flight.
Why do birds migrate?
Not all birds migrate. Some, such as cardinals, live their whole lives within a fairly small area. Many birds migrate long distances, however. Birds migrate primarily for two reasons, to avoid bad weather and to find food. Many geese and ducks leave the north in winter because the water there freezes, and these birds need open water to survive. Warblers, which eat mostly insects, leave North America and go south to the tropics, because there is no food for them in the north in winter.ion: