Dinosaur Train - Season 1 - Eps 44: Jess Hesperornis
The Pteranodons venture to the Big Pond to find out if dinosaurs can live in the water. Their quandaries are quenched when they meet Jess Hesperornis, who turns out to be not only a water-dwelling dinosaur, but a bird as well!
About Dinosaur Train

Title: Dinosaur Train
First Air Date: 2009-09-07
Last Air Date: 2019-11-18
Status: Returning Series
Rating: 6.2/10 (from 37 votes)
Language: EN
Seasons: 6
Total Episodes: 200
Network: PBS Kids
Genres: Animation, Kids
Production Companies: The Jim Henson Company
Synopsis
Join Buddy, a Tyrannosaurus Rex, and his adoptive Pteranodon family on a whimsical voyage through prehistoric jungles, swamps, volcanoes and oceans, as they unearth basic concepts in life science, natural history and paleontology.