What shall we do about poor Tigger?
If he never eats nothing he'll never get bigger.
He doesn't like honey and haycorns and thistles
Because of the taste and because of the bristles.
And all the good things which an animal likes
Have the wrong sort of swallow or too many spikes

Tigger is the most enthusiastic among Pooh's friends. He likes bouncing but he doesn't like climbing trees, and he doesn't like honey. Tigger didn't know what he liked (eating) so he tried a lot of things, but at last he found out that he liked Roo's Strengthening Medicine. Tigger likes to jump, ran and generally do everything that involves being wild.
Tigger is the last friend who joined the group. After he joined them, Pooh and his friends made him a part of the group.