Is It Behaviour or Behaviours?

Behavior is the preferred spelling in American English. Behaviour is preferred everywhere else. Other than the spelling, there is no difference between the two words. The spelling distinction extends to all derivatives, including behaviors–behaviours, behavioral–behavioural, and behaviorally–behaviourally.

Which one is correct behavior or Behaviour?

Behaviour and behavior are two versions of the same word. Behavior is standard in American English. Behaviour is standard in British English.

What is the British spelling of behavior?

They mean the same thing; behaviour is the British English spelling; behavior is the American spelling.