 Two land? No, not that ptera. P-T-E-R-A. Oh, I don't know. Two something. You do. You know a ptera. Ptera. Pterodactyl. Ah, pterodactyl. The flying reptile from the age of the dinosaurs. OK. So the ptera is wings. Right. OK. So diptera means... Two wings. Two wings. We have three pairs of legs. That makes it an insect.