Qual è la differenza tra Hunting e Preys on e If "hunting" concerns the animals like foxes,bears, wild boar which are "catched" by the people and "preys on" concerns the animals which "catch" other animals? Can people "prey on" animals? ?Sentiti libero di rispondere con un esempio.

To prey on/upon has multiple meanings but in relation to 'hunting', it has the same meaning i.e. to catch and kill another animal, usually to eat it.
In general, 'hunting' is usually used in relation to larger animals who catch and kill other animals the same size, or larger than themselves e.g.
1) The lion is hunting a buffalo.
'To prey on/upon' is usually used when an animal catches (or lays waiting for, in a trap) and kills another animal that is smaller than itself e.g.
2) Cats prey upon mice and other small rodents. Or
3) The spider sits patiently on it's web, waiting to prey on small insects.
'To prey on/upon' suggests that the victim is vulnerable in comparison to the hunter.
'To prey on/upon' is sometimes used in relation to humans taking advantage of other, more vulnerable humans. e.g.
4) The con man preferred to prey upon older, more vulnerable people.
'To prey on/upon' is rarely used when referring to humans catching and killing animals. This is nearly always referred to as 'hunting'. e.g.
5) He hunted lions in Africa. Or
6) Last week, he hunted rabbits on a field near to his house.