Researchers from the University of Chicago and China's Beijing Museum of Natural History have discovered fossils of two mammals that lived more than 160 million years ago and which exhibited characteristics that demonstrate their ability to adapt to their ecological habitats since the early stages of their evolution.
Many mammals came perilously close to extinction when a massive asteroid hit the earth 66 million years ago, says a study, adding that if a few lucky species did not make it through then mammals may have gone the way of the dinosaurs.
Using the degraded remnants of tooth genes in birds to determine when birds lost their teeth, researchers have found that teeth were lost in the common ancestor of all living birds more than 116 million years ago.
We know that mammals cannot regenerate lost limbs but they can repair large sections of their ribs. A team of US researchers has now discovered the healing power of the rib cells in both humans and mice.
Paleontologists have affirmed the idea that mammals, an extremely diverse group that includes egg-laying monotremes, originated at least 208 million years ago, much earlier than some previous works of research suggest.
A new study suggests that the advance and retreat of the ice sheets millions of years ago had a profound influence in the evolution and geographic distribution of many animals, including those that live today in the Arctic regions.