BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
What is the most numerous wild bird? Detailed answer Directory / Big encyclopedia. Questions for quiz and self-education Did you know? What is the most numerous wild bird? The most numerous of the wild birds is the African red-billed weaver, whose population is estimated at 1,5 billion individuals. This bird of the song passerine family lives in colonies, in flocks of up to several tens of thousands of individuals. After the end of the rainy season, such a flock settles in a suitable place in tree plantings or in reed supports. Males arrange simple nests here, in which all females almost simultaneously (with a difference of 2-3 days) begin to lay eggs. Incubation lasts 13 days, and after rising to the wing, the entire colony, which has grown many times over, begins to roam around the surroundings. Having settled on a grain or millet field, such a "horde" can completely harvest the crop. This small bird literally terrifies the African population south of the Sahara. In the fight against the African red-billed weaver, even flamethrowers were used. Author: Kondrashov A.P. Random interesting fact from the Great Encyclopedia: Why are fireflies lit at night? Is there a person who would not be amazed by the fireflies? Children love to catch them, put them in bottles or hold them in their hands while the little living lanterns sparkle with soft light. One thing that might surprise you, and scientists too, is the mysterious glow of fireflies. This phenomenon is still not entirely clear; there are many inexplicable things in it. Firefly lights have a lot in common with other light sources, only they are not accompanied by heat. This kind of light is called luminescence. Fireflies produce light from a substance called luciferin. When combined with oxygen, a glow is formed. But this reaction won't happen without another substance called luciferase. It acts as a catalyst, that is, it helps to carry out a chemical reaction, and allows luciferin to burn to form light. Now scientists can reproduce this light in the laboratory. But in order to do this, they must remove the relevant parts that create light from the insects. Chemists cannot recreate the light of these amazing insects on their own. It still remains a secret of nature. Why are fireflies lit at night? There are many explanations for this phenomenon. One of them is that light helps males and females find each other. Another reason is to scare off nocturnal birds that try to avoid night light. But scientists still do not know for sure why fireflies need lights so much, since all the assumptions do not seem to be entirely justified. They think that light is a side effect of the chemical reactions going on in the body of fireflies. Maybe it is formed, but it is not vital. But whatever the reasons for this phenomenon, most of us are glad that it exists, because it is nice to look at these small insects, these living lanterns, moving in the dark of the night.
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