Q: Par quoi le dinosaure a-t-il été suivi?
R: Sa queue!
The question 'What followed the dinosaur?' makes us think of what came after dinosaurs in the history of the world. So the answer would be 'animals' or 'people'. But another way to think of the question is 'What comes after the dinosaur's body?' - it's tail.
I hope that helps.
LearnEnglish Kids team