Great Dane gives birth to green puppy

These people were extremely surprised when their Great Dane gave birth to a green puppy! The rare phenomenon is thought to happen when light-colored puppies come in contact with biliverdin, a green pigment found in bile. It's the same pigment you can see when bruises turn green. It essentially dyes their fur in the womb, and the color fades over time. They named him HULK of course!