When threatened by predators, they have been said to sometimes feign death.

The risk of attack by predators should be considered.

This may be due either to near misses by predators such as birds or to fighting with other males.

It can roll up into a ball when threten by predators.

In the case of lambs, death can have many causes apart from attacks by predators.

It is possible to work hard at a complete system and get very little from it because of interference by other predators.

The detection by predators and competing individuals of same species provides a strong evolutionary pressure.

There is also the factor of species preferences by predators.

This allows the tails to break off when grasped by predators.

So they live side by side, predators and their prey.