Despite the species difference - even if Doyle was trying to think of himself as a person in a dinosaur's body - he still recognizes the smile.

"Heh. Yeah."

He kind of shrugs, a little.

"Uh - You don't have to fly back to the city now, if you want - I uh. Give you a ride."

... It's different when he's offering it to a parrot, okay?