Time Traveller

You wander South. Ahead of you there is a huge cliff, but there are still no dinosaurs in sight. Suddenly though, when you are about to turn back, there is a deafening screech, and you look up.

Diving towards you is a massive Pterodactyl, bigger than you ever seen in any books you have read on them. It is diving towards you at high speed, with claws outstetched.

What are you going to do?