No, they're not chewed-up pieces of gum, quit salivating. These are the world's first transgenic prairie voles, which were injected with a jellyfish gene as embryos, resulting in glowing baby voles.

Researchers inserted the prairie vole genomes with a glowing jellyfish's gene, which contains a fluorescent protein that makes it glow. Once the embryos grew into prairie voles, the jellyfish gene was evident in its glowing skin, and even their children had similar strengths of luminescence. These prairie voles will help scientists discover genetic secrets of pair bonding, social behaviors, understand psychiatric disorders better, and also intrigue and fascinate. Look! Glow in the dark voles! [Science Daily]