Extreme Animals - Series 1 - Tough Nuts

Caroline Flack and Reggie Yates host a children's wildlife series in which viewers vote for one of ten featured animals in different categories. In this programme there are some really hard nuts. There are kangaroos, thorny devils, koalas and baboons, and they're all extremely tough. But can you guess exactly why the pink fluffy flamingo is in the line up, or a tiny cricket, or some tiny Christmas Island crabs?