Birds live in groups, which is conducive to predation. Brown, a biologist at Yale University in the United States, pointed out that social birds can find more food with less effort and time. 1983, he observed a flock of birds intently. Because the environment around the flock is an open plain: the flock feeds within a kilometer, and Brown can observe the flock flying between the nest and the feeding ground with a telescope. He saw that one swallow often followed another swallow all the way to the feeding place. This is their way of exchanging information and telling their companions where to catch food. 1982, biologist Morrison began to study starlings. This kind of birds often live with more than100000 birds. Morrison put miniature radio transmitters on some birds and then let them out. He found that starlings are concentrated in food-rich areas and spend days to weeks hunting. In the meantime,
Birds often change their habitats. Sometimes, some birds need to fly a few kilometers and temporarily live in another food place as an outpost to find a new food base.
Birds live in groups and are vulnerable to enemy attacks. At the same time, social groups often compete for food and living space, and even the reproduction and brooding of young birds are affected. When living in groups, it is often that one male mates with many females, and some females steal food.
Stealing land and laying eggs in other nests. So, why do birds eventually choose to live in groups? Many biologists think this is for safety. Social birds are good for defending against the enemy. A flock of birds makes the greediest enemy feel helpless and can only wander on the edge of the group.
Birds are more vulnerable. Joanna? From Long Island to Argentina, from India to South Africa, Bugu observed the behavior of birds against the enemy for fifteen years. In the early 1970s, as a college graduate, she spent five years carefully observing the seagull ecology in the Minnesota swamp. Cuckoo found that seagulls used all the advantages of the group to resist the enemy. On many occasions, they can swear to their companions to prevent fierce enemies such as cranes and minks from attacking. She also found that the center of the group was less affected than the edge of the group.
Gull's most dramatic strategy is to make the attackers succumb to their counterattack. Bugu described that when an eagle appeared over the flock of gulls, a flock of gulls took off at the same time, called and stopped the attacker and dived until the attacker escaped. Several times, seagulls drove the eagle 500 yards away from the flock. Once, the gulls even attacked a giant deer that ran into them. The result is very interesting. The giant deer quickly left the flock like a flock of mosquitoes.
Group counterattack and early warning are also important defense strategies for yellow-tailed birds. In the early 1980s, Robinson spent 23 months observing yellow-tailed birds on two lakes in southeastern Peru. He recorded the ecology of 750 yellow-tailed birds in detail and was particularly interested in their nesting sites. These nests can resist toucans, long-legged eagles, capuchins and snakes. Yellow-tailed birds also have amazing flexibility in choosing safe nests. The island nest they chose can defend against monkeys and snakes and all kinds of foreseeable invasions. When the island nests lose their effectiveness, they nest near the hive, making wasps a pioneer in defending monkeys and snakes.
I hope I can give points