The term for a wild cat is just that - "a wild cat".
there is no such word
wild
heterotroph
The term 'wild animal' (plural 'wild animals') is a noun, a common, compound noun; a word for creatures, things. The compound noun 'wild animals' is made up of the adjective 'wild' and the noun 'animals' to form a word with its own meaning.
invertebrates
Feral as in feral animals; wild
expirenced
Your use of the words "are returned" is confusing. A feral animal is an formerly-tame animal (such as a pet cat or dog) which has escaped and returned to the wild behaviour of its kind. I don't believe there is a word which describes animals which have been raised - or born and raised - in captivity and then returned to the wild.
Poacher means a person who chapters wild animals or shoot wild animals to get money
agriculture
orgy
The wild animals were exotic.