Everyone knows dinosaurs got really big. Some of the long-necked plant-eaters were the largest land animals ever on Earth, as shown by Argentinosaurus, perhaps 70 to 90 tons and upwards of ​100 feet (30 meters) long. But how about tiny dinosaurs, like the size of a mouse? As far as we know, none ever existed.

Research suggests that competition with mammals may explain why non-bird dinosaurs never evolved into truly tiny animals.

Dinosaurs are famous for being big, from the towering Tyrannosaurus rex to the colossal Apatosaurus. But a new study suggests that one of the greatest mysteries of dinosaur evolution isn’t ...

Abstract. Vertebrates have varied body size distributions. Among these, non-avian dinosaurs have uniquely large minimum and maximum sizes, but the reasons

New research finds that birds, the only living dinosaurs, evolved larger eggs as their brains got bigger.

Abstract. Birds and mammals mostly produce clutches with small numbers of large individual offspring compared to non-bird reptiles, including dinosaurs on

Body size evolution is commonly associated with climate change. For example, birds and mammals have been found to decrease in size with anthropogenic global warming. Recent studies have inferred dist...