A Permian Parable

A Dimetrodon and an Edaphosaur
One day happened to have a chat
Wherein the Dimetrodon remarked
That they were both getting rather fat.

"The issue with my waistline
Has its roots within my head.
And if you come a little closer
I'll explain just what I mean."

For a moment the Edaphosaur hesitated,
his feeble brain gave him an inckling of dread,
but since they both had sails upon their backs
he figured that they must have temperments equally serene.

"Obesity is caused by caring for our dentition"
continued the Dimetrodon, who smiled as he said
"A little closer perhaps and you'll see
That I keep every single tooth of mine exceptionally clean."

Now, an Edaphosaur is quite stupid
And he is easy to mislead
So that while examining his companion's teeth
he became trapped in between.

Thus by eating other poor pelycosaurs
The Dimetrodon keeps himself well fed.
He gives the appearance of being docile,
but is not what he seems.