A bat’s wings may look like sheets ... to turn nails into claws. The discovery of the molecular toolbox for hand building has given scientists a deeper understanding of Darwin’s great insight.

Extending from the sides of the body and incorporating the hands, legs, and tail are the two thin ... are usually specialized by having huge hind feet and claws. The best known of the fish-eating bats ...

feet,” coaxes Brooke Slack, a biologist at the Kentucky Department of Fish and Wildlife Resources, as she stands on tiptoes and reaches with gloved hands ... loosens the bat’s claws from ...