Calgary, Alberta, Canada (AHN) – New research says that present-day mammals ruled the earth after the dinosaurs, but that they were twice as big as they are today.
Based on a massive database of fossil records compiled over two years, scientists conclude that 65 million years ago after dinosaurs disappeared, the world’s rhinos, elephants and other large mammals took their place but were twice as big as they are today, weighing as much as 17 tons.
This new research on fossils appeared Thursday on the journal Science and was funded by a U.S. National Science Foundation grant, that brought together scientists from all over the world to determine how large mammals grew across the globe and to analyze their patterns of growth as time passed.
The study found that since there were no more competing dinosaurs, mammals ate a lot of abundant vegetables and grew huge fending off predators and staying warm.
The study is not without its critics however, foremost of whom is Donald Prothero, author of After the Dinosaurs: The Age of Mammals, who says that he is worried the study is making generalized statements based on just a few of the largest lineages.
Prothero claims that the fossil survey used in the study lacks enough detail to support the statistical analysis done in the study, which finds the mammal size limit significant.
Biologist John Alroy of Australia’s Macquarie University is more skeptical of the findings. In a public e-mailed statement he said, “I don’t believe the results, which are actually inconsistent with the data they show.”
View full post on Arts, Culture And Entertainment Stories