An ultra-rare all-black penguin has been spotted on South Georgia Island, standing out among its more typical black-and-white buddies by bucking the tuxedo trend with an entirely black body.

A photographer went to South Georgia hoping to find a yellow penguin he saw three years ago. Instead, he found an even rarer ...

This change from predominantly light to dark forms in industrial areas is called industrial melanism. Note that this change was not due to pollution making the moths darker. The dark variety had ...