Glowing scorpion

I went to Butantan Institute, a research facility dedicated to study snakes and other poisonous animal. They also produce antivenom serum and vaccines. There is a museum in there with live snakes, spiders and scorpions. I have visited there many times since I was a kid. Today, I took my son there for the second time.
I've learned today that some species of scorpion, when under the proper light, glow.