Because you could not have Ringo Star in a leopard skin breechcloth battling a simple BEAR with a club while Raquel Welch looked on (looking pretty good I might add in her leopard skin bikini!)
Cave men fought off Cave Bears and Cave Lions! Dont you see, it had to be!

)))))
More concisely, BTSOM!!! But I thought I would have some fun with it!!!
Regards