You've made it to the Cretaceous period, where the puns are so bad, they're good. Why did the Dinosaurs go to the party? Because they were Dino-Mite! Party on!
And don't forget, the T-Rex was just a Trex-cellent singer. He had a dino-saw. Sing-along!
But wait, what about Pterodactylic puns? Why did the Pterodactyl go to the doctor? Because it had a flying sickness! Get well, Pterodactyl!