He's done giving rides.
Snake: Otacon! What's this lizard thing?
Otacon: That's a Yoshi. It's a dinosaur from Yoshi's Island.
Watch out for its long, chameleon-like tongue. If it gets you, you'll be swallowed whole.
Snake: It lays eggs and throws them, right? ...then it must be female.
Otacon: ...actually, it's a "he". At least, that's what it says.
Snake: It talks!?
Otacon: Yes! It talks! Well, kind of...
Snake: Now you've got me curious...how about I capture one so we can see what they taste like?
Otacon: Uhh, Snake...