Are there dinosaurs now?

Dinosaurs became extinct in the late Cretaceous period about 65 million years ago, and there are no living dinosaurs on Earth now.

The existence of dinosaurs spanned three periods of geological time, namely the Triassic, Jurassic and Cretaceous periods. They began to appear in the late Triassic period about 230 million years ago and became extinct in the late Cretaceous period about 65 million years ago, a total of about 160 million years.

Dinosaurs are a type of prehistoric reptiles that lived on Earth. They appeared in the late Triassic period about 230 million years ago and existed until they became extinct in the late Cretaceous period about 65 million years ago. Dinosaurs vary in size and appearance, ranging from species as small as sparrows to species as huge as mountains. They usually walk on all fours, and some species can run and fly.

Dinosaurs are one of the most successful groups of vertebrates. They have thrived on Earth for more than 1.6 million years and have evolved many unique features and adaptations. Dinosaurs are divided into two categories: Ornithischians and Saurischians. Ornithischians mainly include some dinosaurs that look like birds, such as Tyrannosaurus and Velociraptor, while Saurischians include some larger and heavier dinosaurs, such as Brontosaurus and Ankylosaur.

The cause of the extinction of dinosaurs has not yet been fully determined. Scientists currently believe that it may be caused by a series of natural disasters and climate change. Although dinosaurs are extinct, their remains and fossils have been found all over the world and provide important clues to our understanding of the evolution of prehistoric creatures and Earth history.

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