The shape of a creature is determined by the environment at that time. The ancient biological wisdom was not developed, so it was a natural choice to compete for living space by individual size.

1. Dinosaurs lived about 235 million to 65 million years ago and were able to walk upright on their hind legs, ruling the global terrestrial ecosystem for more than 654.38+600 million years.

Most dinosaurs have been extinct, but the descendants of dinosaurs-birds have survived and multiplied to this day.

In addition, in spoken language, dinosaurs refer to ugly women. The word "dinosaur" has two meanings in the dictionary: an ancient animal that lived hundreds of millions of years ago and is now extinct; (Internet language) A woman with bad looks in contemporary times.