although pterosaurs are close relations, they are not true dinosaurs.
Even more distantly related to dinosaurs are the marine reptiles, which include the plesiosaurs and ichthyosaurs.
Mammoths and mastodons are mammals and did not appear until many millions of years after the close of the Cretaceous period.
When did mastodons go extinct?
Mastodons went extinct around 10,000 years ago.
Do mastodons still exist?
And though they might resemble their distant, mammoth cousins, mastodons came into existence even earlier, about 27 million to 30 million years ago. They lived primarily in North and Central America and, like mammoths, began to disappear between 12,000 and 10,000 years ago.
What is the difference between a mastodon and a mammoth?
Mastodon were shorter and stockier than mammoths with shorter, straighter tusks. Mastodons were wood browsers and their molars have pointed cones specially adapted for eating woody browse. Mastodon have straighter tusks and pointier teeth; mammoths have curled tusks and flat teeth.
When did mastodons roam the earth?
Mastodons, which first appeared on earth around 20 million years ago, pre-date mammoths, which arrived some four to five million years ago. Mastodons also became extinct first, departing about 12,700 years ago, Lobbig said.