When I was a kid, I kept Freshwater Tropical Fish. I recall that, back then, you could buy killifish eggs through the mail. These were the eggs of a small colorful fish that could be kept indeterminately out of water.. Appearently they thrive in the lakes of Oz that dry out during the Dry Season. The idea was that you could introduce these eggs into your home aquarium, no matter where you lived in the world, and they would hatch and develop with no ill effects.

Killifish. Funny how things like that stay in your mind well into Adulthood.