Among animals, the predators (like lions) have their eyes facing forward at the front of their heads, whereas the animals of prey (like rabbit) usually have eyes at the sides of their head. Why is this so?

Predators (like lions) have their eyes facing forward at the front of their heads because this enables them to judge the distance of their prey accurately and catch them easily.

Animals of prey (like rabbit) usually have eyes at the sides of their head because this provides them the widest possible field of view. They can, therefore, see their enemies (predators) in a very large area around them and try to escape.