Fighting marmots create a spectacle for hikers in China

Cow accidentally flips his friend during scuffle

Russian MoD unleashes 'Yars' as missile crews battle for dominance

Asian black bears wrestle for dominance in front of tourists

Two ferocious monitor lizards wrestle for dominance in dirty canal

Monitor lizards appear to hug as they battle for dominance

Two monitor lizards wrestle for dominance in family's garage

Female silverback gorilla displays dominance beating her chest in Texas zoo

Testosterone-fuelled male elephants seen fighting for dominance in Thailand