Information about dinosaur fossils

Cretaceous is the last period of dinosaur life, and it is also a period of great changes in the earth's landscape. When the sea level reached a record height, the shape of the continent was very similar to today. Flowering plants appeared, and so did many insects from bees to ants. The monitor lizard and the giant turtle swim together in the ocean. In the air, pterosaurs spread their wings to 12 meters. On land, dinosaurs dominate, and their size and shape exceed all previous types. Herbivorous dinosaurs grew to100t, and carnivorous dinosaurs grew to12m.

Hadrosaurs were the most advanced herbivores before Cretaceous. Such as this female dragon.

Hadrosaurs may be caring parents, feeding helpless cubs in their nests.

King of carnivorous dinosaurs

In the Cretaceous, new giant carnivorous dinosaurs appeared. They all have powerful jaws, short forelimbs and long hind legs. The last giant killer is the smartest and most powerful Tyrannosaurus Rex. But 35 million years before that, bigger dinosaur killers lived in North Africa and South America.

The largest of all carnivores is the dragon. This dinosaur from Argentina is over 12 meters long and weighs 10 ton. It is at least heavier than the largest Tyrannosaurus Rex, equivalent to the weight of a minibus.

Tyrannosaurus rex is one of the largest animals in the world where it lives, and Tyrannosaurus rex eats herbivorous dinosaurs many times larger than himself. The largest animal that once lived on land almost lived in the same area as the giant Barosaurus. This is a herbivorous dinosaur weighing 65,438+000 tons-Argentinean dragon.

The largest carnivorous dinosaur, the giant Barosaurus, preyed on the giant herbivorous dinosaur Liberon.

Almost the same dinosaur species as these South American dinosaurs also live in North Africa.

Giant Baron's teeth are thin and sharp, which is an ideal slicing tool. Its teeth have sharp serrations, just like a serrated knife. Tyrannosaurus rex also has serrated teeth, but its teeth are much thicker and used to peel or break muscles from bones.

Microraptor

During the Cretaceous period, a new deadly hunting animal, Raptor, appeared. These dinosaurs ranged in size from poodles to trucks, but they all had sharp teeth and curved claws, and each hand and foot could kill their prey. Recently, giant raptor fossils have been found from Utah to Japan. A huge dinosaur fossil resembling a raptor was found in Argentina. Giant raptors are not real raptors. Its limbs have a claw as long as 6 cm.

The most chewy animal known on earth is hadrosaurs. They evolved from Iguanodon, and gradually grew as many as 800 teeth arranged in a comb shape: when one row of teeth was worn away on rough plants, another row of teeth always replaced them. In addition, the hadrosaur's jaw chewed food in three directions, and it could move up and down, back and forth and sideways, just like an accordion.

Phytophagous dinosaur

As sauropod dinosaurs continued to roar in many parts of the earth, bird-buttock dinosaurs evolved into new types. Armored dinosaurs grew to the size of tanks.