[thaumasiotes]

But as soon as you've gone up from a chicken to the ancestor of a T-Rex, you do indeed find that T-Rexes are in the mix. They look different from what you'd normally think of as a T-Rex, in the same way that they also look different from what you'd normally think of as a chicken.

[stevage]

I'm trying to imagine this creature that is only somewhat different looking from a t rex and a chicken.

I get your meaning, just a funny phrasing.