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By count of individuals, dinosaurs are the most successful land vertebrates today.
At least 4 species of dinosaurs survived the K-Pg boundary. One was the ancestor of large flightless birds like ostriches. Another was the ancestor of waterfowl like ducks and geese. Another was the ancestor of land fowl like chickens and turkeys. And another was the ancestor of the other 95% species of birds.
Fortunately for their genes, and unfortunately for the individuals, humans find the descendants of two of those dinosaur species very tasty.