Birds and the insects have to evolved to take the advantage of the benefits of the flight including to travel long distances escape from the predators
A predator is an organism that hunts and kills other organisms for food. Organisms that are consumed by predators are called prey. Predators include carnivores and omnivores. Lions, tigers, sharks and snakes are all predators. Weasels, the hawks, wolves, the mountain lions, and the grizzly bears are all the predators. Predators are carnivores. That is, their diet consists of meat. Some predators such as coyotes and bears are also scavengers. That is, they eat the carcasses of animals that they have not hunted themselves. A predator is a wild animal that hunts or hunts other animals for food. They eat animal meat to survive. A predator is a carnivore, an animal that eats only other animals. Not all predators are capable of killing their prey and are called scavengers.
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