Stegosauri

They had plastic sabre-toothed tigers, tyrannosauri, brontosauri and stegosauri.

Pardon? It's a well-known fact that all female stegosauri (stegosaurae) were called Glenys.

Right....cats, like stegosauri, have spiked tails they use as weapons.

By Part VIII, the valley is obviously accessible because a herd of stegosauri ("spiketails") is passing through.

Harris Tweed tried it next and was nearly trampled by a herd of angry stegosauri.