predators

As one of the most brutal predators (食肉动物), killer whales may not fit the image of a cultured creature.

She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators.

But, as the human study suggests, another reason for dolphins keeping their eyes open during sleep is that they can look out for predators while asleep.

wild pigs attracted golden eagles from the mainland, and those flying predators crashed the fox population.

This idea is based on the principle that lions and other predators are far less likely to attack when they feel they are being watched.

Three-quarters of the world's flamingos fly over from other salt lakes in the Rift Valley and nest on salt-crystal islands that appear when the water is at a specific level一too high and the birds can't build their nests, too low and predators can move bri

When the water hits the right level, the baby birds are kept safe from predators by a corrosive ditch.

And unplanned human activities have proved the idea of top-down control by top predators to be true.

In the 1960s, scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other species - including species they did not directly attack.

In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves.

It is thought that they are capitalising on their predators天敌fleeing to quieter areas.

Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.

The species they indirectly attack will turn into top predators.