Stegosaurus

Bumpy, pokey, stiff and strange,

Lumbering slowly through its range.

Those plates and spikes, why were they there?

To dress in socks and underwear?

Were they there to string with lights

To help Stegosaurus see at night?

Maybe it was just to look unique

From spiky tail to pointy beak.

Of all the uses, this is most right:

Plates to show off and spikes to fight.