sentences:  in Switzerland for wild cats), where computer programmed various mechanic devices allow the animals in the enclosure to search for prey as in their natural environment.However, in some cases animals in zoos need to be fed with other live animals, because they would not eat non-living food items.Whenever this has to be done however, the prey should have, as in natural conditions, a possibility to hide and it must be assured that the prey animal is killed as quickly as possible without pain and suffering.