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Even the most massive birds have never reached the sizes of their dinosaur relatives
Evolution has a fondness for big birds. During the past 66 million years, repeated on different continents and islands all over the world, avian dinosaurs have reached prodigious sizes and even become apex predators in their ancient habitats. Ten-foot-tall elephant birds strutted across Madagascar until a thousand years ago. The sharp-beaked “terror birds” of prehistoric South America were formidable carnivores for tens of millions of years. And the nearly seven-foot-tall, nut-cracking Diatrymastrutted through ancient forests of western North America in search of ripe fruit and nutritious seeds 45 million years ago. Such enormous birds almost seem like a return to the Mesozoic days of giant, feathery dinosaurs, which raises the question of whether such avians could ever reach Tyrannosaurus rex sizes.
Continued below.

Why Have Birds Never Gotten as Big as T. Rex?
Even the most massive birds have never reached the sizes of their dinosaur relatives