The story behind the most fascinating, hilarious and dramatic quests to find a mate, 66 million years ago.

Some species need to overcome the challenges of a vast environment just to find a member of the opposite sex. Others find themselves pitched against their neighbours. Some must impress with complex displays. Others build extraordinary structures just to prove their worth. One thing, however, connects them all - the drive to succeed at all costs.

This video is a mashup of series Prehistoric Planet and The Mating Game.