In the animal world, the buzzard is a very common swamp bird, there are about 130 species of buzzards, and different buzzards, the size of the difference is also very large, there are small buzzards, about 11 cm long, there are also some large buzzards, about 45 cm long. I thought that the larger the buzzard, the worse the ability to fly, but there was a smaller and can not fly the buzzard - desert island buzzard.
The desert island buzzard generally weighs about 30 grams, has an average length of 17 centimeters, black brown feathers throughout, and a pair of red eyes. The habitat of the deserted island buzzard generally lives on remote islands, including Inaccessible Island, an island in the remote ocean of the Atlantic Ocean, where there are more than 6,000 such small buzzards.
In 1920, scientists first discovered this small buzzard, which surprised them very much, because they were small, slow and slow, and they could not fly. Even stranger is how the little buzzards reached the islands between Africa and South America, 3,500 kilometers from South America and 2,800 kilometers from southern Africa.
Some scientists speculate that millions of years ago, the island had bridges connecting the land until the sea flooded, so that these desert island buzzards had to stay on the island. Eventually, scientists studied blood samples from the desert island buzzards, sequenced them, and confirmed that they belonged to the kuroda genus, and that 1.5 million years ago, the ancestors of the desert island buzzards flew from South America to the island, where the biological chain was very primitive, with only a few birds and insects, making them the highest predators in the food chain here.
In the food chain, birds fly to prey, or to avoid predators, and on this island, they are at the top of the food chain, not to avoid predators, but also to find food on land, where will so much energy be wasted flying? Eventually, he slowly gave up the ability to fly and became one of the smallest buzzards that could not fly. Giving up flying, I don't know if the desert island buzzard is evolution or degeneration.
Desert island buzzard chickens on this island after 1.5 million years of life, but the number of only more than 6,000, and did not flood, perhaps they have long adapted to each other according to the amount of food to restrict each other, less bugs, young birds low survival, when there are fewer birds, bugs began to increase again, and the corresponding young birds survival rate is high, this is a process of mutual restraint!
Desert island buzzards are found in the nearby islands of Australia and New Zealand, they generally feed on insects, earthworms, moths, berries and seeds, etc., and the ecology on desert islands is very primitive and fragile, if snakes, cats and even mice land on the island, these birds that are good at flying have become flightless birds, and invasive alien species are fatal to their populations.
Pay attention to the six dimensions of nature And let nature know nature!