National Geographic has a gallery titled GLOWING ANIMALS: Pictures of Beasts Shining for Science, which includes pictures of animals that have been engineered to become fluorescent using Green Fluorescent Protein (GFP)...
https://www.neatorama.com/2009/05/27/glowing-animals/
Xenon {wiki} is the heaviest non-radioactive noble gas. It affects your voice like sulphur hexafluoride (previously at Neatorama) and can get you high like nitrous oxide (laughing gas). Don't try this at home; just watch...
https://www.neatorama.com/2009/05/27/breathing-xenon/