Thunder is a Scottish Clydesdale horse with a Scottish accent.
In the Movie
Thunder watches over Darwin in the horse stables. When Darwin suggest that he could use a hot bath and meal. Thunder says they'll be bringing the hay down any minute which Darwin exclaims he doesn't eat hay. He tells him that he eats sweet and crunchy oats from time to time. Thunder's tail goes up and he lets out a fart from his butt. Darwin thinks that is why they call him Thunder do to his farts.
- Darwin assumes they call him Thunder is because of his loud farts.
- Oats is what seems to cause his repulsive farting.
- Thunder seems to not care whether he farts, so he must do it often that he is used to it.