Researchers in Taiwan have engineered pigs that glow green in fluorescent light, thanks to the addition of a jellyfish gene. These kinds of animals are useful for biomedical research. (And provocative art too.) From the BBC News:
The researchers, from National Taiwan University's Department of Animal Science and Technology, say that although the pigs glow, they are otherwise no different from any others.Link
Taiwan is not claiming a world first. Others have bred partially fluorescent pigs before. But the researchers insist the three pigs they have produced are better.
In daylight, their eyes and skin are green-tinged
They are the only ones that are green from the inside out. Even their heart and internal organs are green, they say.