Pteranodon

"This large, birdlike reptile has a long, toothy beak, a thin headcrest, sharp talons, and small claws at the joints of it's leathery wings. Its eyes are large and yellow, it's scaly skin sprouts small tufts of downy feathers."

Pteranadon are ranked among the behemoths. They are large dinosaurs who are encountered in the wild and even occasionally trained for use as flying mounts, much like dragons albeit a lot less intelligent mounts.

Physical Description
A pteranadon is behemoth with their sharp talons and leathery skin. One of the few flying behemoth species, this monster is able to fly quite aptly due to its leathery wings. Combined with a beak, the pteranadon holds the middle ground between a reptile and a bird, although its beak is beset with razor-sharp teeth.

Combat
When attacking in combat, pteranadons use the same technique as when they swoop down on water to catch the fish they feed on. Diving steeply, they like to swoop down on their opponents both in aerial combat as when attacking opponents on the ground.

Training a Pteranadon
These powerful beasts can be used as a flying mount in aerial combat. To train one is hard work, taking a skilled rider six weeks of training. The effort pays off with their ability to dive onto unsuspecting targets, making them and their riders a formidable opponent. Being strong creatures they can also be employed to transport cargo since they can drag up to 4,500 pounds.

In the Realms
The Jungles of Chult form the habitat for most behemoths, including the pteranadon.