Thunderclap

Thunderclap is the foremost antagonist in The Good Dinosaur. He is a Nyctosaurus and the leader of a ferocious gang of Pterodactyls.

Official Bio
"The Pterodactyls are a search-and-"rescue" team of five. They like to sit back and let the often-treacherous storms in this part of the world do their dirty work, then reap the benefits of the devastation. But when these flying hunter-scavengers set their sights on Spot and Arlo, they’re in for a big surprise.

The Good Dinosaur
Like the other members of his flock, Thunderclap is a scavenger that follows storms to prey on trapped critters. He seems to be slightly deranged, having a sort of fascination and veneration for storms. He claims that he used to be scared and shy, until he had a "relevation", when he saw "the Eye" in a storm. He believes that the storm freed him of fear. Thus he renamed himself "Thunderclap", going by the motto that "the storm provides."

Following a violent storm, Arlo and Spot are found by the Pterodactyl flock. At first Thunderclap acts friendly with Arlo, recounting to him his story. However, his true motives become apparent when Thunderclap eats whole a small fox that Arlo helped to free. Thunderclap and the others then set their sights on Spot. Arlo and Spot flee, and are saved when the T. rexes Nash and Ramsey come to their rescue and scare away the pterodactyls.

Sometime later, Arlo and Spot are stuck in yet another storm. Thunderclap and his gang find them again and they succeed at taking away Spot. With a newly-found courage, Arlo faces off the pterodactyls and defeats them. Thunderclap ends with a gaping hole in his left wing, and falls in the river when Arlo throws a stick at him as he was trying to fly away.

Trivia

 * The other three members of Thunderclap's gang are each a different species: Caulkicephalus, Guidraco, and Ludodactylus.
 * Real Nyctosaurus do not have teeth or wing claws like Thunderclap does.