Answers to the odd one out
Toffa is the only king who was not a King of Abomey. He was, in fact, the King of Porto Novo. It's Toffa, therefore, who's the odd man out.
All of them are mammals (they nurse their young) except for the fish. It's the fish which is the odd one out.
All these animals are vertebrates (that is to say they have vertebra, i.e. back bones) except for the cricket. So he's the odd one out.