SCIENTISTS have created glow-in-the-dark MONKEYS to help understand how genes are passed down to offspring.
Researchers in Japan first created a genetic virus containing a green fluorescent gene.
They exposed female marmoset primates to it so it merged with their DNA and was passed down to their offspring a world first.
The baby monkeys feet then glowed bright green under ultraviolet light.
Scientists will study them to find why certain genes cause diseases in some babies but not others.