Each forest has its own tiger.

[inorderto]

Is "Each forest has its own tiger." a collocation or an idiom in English? If not, please help me find a collocation or an idiom that can express this sentence.
Thank so much.

[David L.]

This is neither an idiom nor a colloquialism. I think the writer has coined this aphorism.

You are looking for an idiom (that escapes me) that means: 'danger lurks whenever we stray'.

I mean 'stray' in the sense of 'to wander or roam'; and this is, 'away from the customary/conventional/usual - into the 'unknown'.