Archie Dinosaur

Archie Dinosaur is usually a no-frills kind of dinosaur – but he admits he is quite particular about some things...
For a start, he avoids mountains that aren't perfect triangles (lumpy bits put him on edge). Then, he'll only read novels that are part of a trilogy (he's read The Cretaceous Chronicles several times). And his chosen sport: triathlon. He's a slow swimmer but makes up good time on the tricycle stage.
And when he feels like giving up, he reminds himself to just try, try and try again.