Lizard that Hulks out shows off its superhero genes

Enlarge (credit: Kristian Bell)

The lizard Podarcis muralis nigriventris might not grow to a freakish size and smash everything in sight, but evolution has turned this lizard into the Incredible Hulk of sorts—green skin included. P. nigriventris is something like the imposing Marvel superhero when compared to other strains of common wall lizards (Podarcis muralis). While the common version tends to be relatively small and brownish to greenish-brown, the nigriventris subspecies...