Noun
Any animal living in a natural, undomesticated state.
(figuratively) One exhibiting uncontrolled behaviour.
Source: en.wiktionary.orgwild-animal
Some of you think an Indian is like a wild animal. This is a great mistake. Chief Joseph
Jem spoke with enormous care; talking to Will about anything personal was like trying not to startle away a wild animal. Cassandra Clare
No domestic animal can be as still as a wild animal. The civilized people have lost the aptitude of stillness, and must take lessons in silence from the wild before they are accepted by it. Karen Blixen
If men were now to turn their hostility towards the cat, it would not be long before the domestic cat becomes a wild animal. Nigerian Proverb
Better to be watched by a wild animal than a nosey man. Berber Proverb
If you haven't any sheep you won't know that a fox is a wild animal. African Proverb