Sulu didn't need Ianto to explain to him how awesome feeding a dinosaur was; he definitely knew. (He'd just had first-hand experience. Oh, yeah, Jim was going to be so jealous.)

He watched Ianto interact with Myfanwy with interest; it was strange to see her acting like any other domesticated animal, though it did give him a little hope for Audrey. He had to take his reassurances where he could get them.

When Ianto put his and on the pterodactyl's neck, he tensed briefly. When she didn't... well, try to throw him over the edge, though, he relaxed and beamed. "Oh, now you're just rubbing it in." He ran his hand experimentally along the neck, looking nothing short of impressed.