The finding supports an existing idea that the three master
limb - replacers last shared a
common ancestor about 420 million years ago, and it suggests that the evolutionary process
of growing
limbs is saved over time, not developed independently in separate species, the researchers report today in PLOS ONE.
Today's Bulldogs, typified by their large and flat - faced head («brachycephaly»), bowed
limbs, broad chest, low - slung body, and corkscrew tail has little in
common with the athletic build
of their sporting
ancestors.