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Female koalas, when in captivity, can engage in lesbian behaviour.
Excessive TV-watching in childhood has been linked to antisocial and even criminal behaviour later in life.
The hierarchy that exists within each pack is maintained by dominant or submissive body posturing, and by other behaviour patterns such as the communal care of the young.
Lions communicate through a range of behaviours and their expressive movements are very highly developed. They will perform peaceful tactile actions such as licking each other and rubbing heads. Head rubbing, or nuzzling, is a common greeting behaviour for lions. They also communicate through a variety of vocalisations including purrs, snarls, miaws and hissing. Their vocalisations also vary in intensity and pitch.