Experts say that large animals are “eaten up.” Scientists have studied about 300 megafauna kinds, including mammals, fish, birds, amphibians and reptiles.

Consequently to researchers, over the past 500 years, 2% of megafauna kinds have disappeared from Earth, because of that people have learned to kill from a safe distance.

Over the past 250 years, nine kinds have become defunct, either worldly or in the wild, including two kinds of giant turtles, one of which vanished 7 years ago.

In general, 70% of the studied species were in a state of decline, and 59% were on the verge of vanishing.

The group adopted the definition of megafauna based on different weight thresholds for mammals, fish, amphibians, birds and reptiles.

Species that were unusually large compared to others from the same family of animals were also included in the list.

One example of a surviving species was the Chinese giant salamander, which can grow up to 6 feet in length and is considered a delicacy in Asia. According to experts, its extinction in the wild was inevitable