Ari Daniel

Maybe there's better food up there or less predation, but it's still an open question.

Okay, this one takes us to the Shedd Aquarium in Chicago to a fish that the staff there believe has never been reared before in captivity.

The aquarium has a small tank with two warty frogfish.

It'd be a great costume, actually, now that you mention it.

Each one's about the size of a tennis ball.

They're bumpy and yellow with splashes of red, says senior aquarist Jenny Richards.

They are cute, but cutthroat.

Part of its dorsal fin is a lure that looks like a little shrimp, which it uses to attract its prey.

Last fall, the female in the tank began to look kind of bloated, and then she released a raft of tens of thousands of eggs, which the male then fertilized.

Absolutely.

But each species has its own specific needs.

Within a few days, though, thousands of tiny larvae had hatched out.

The aquarists focused their efforts on 500 of them.

They fed them tiny crustaceans.

And gradually, the larvae underwent a series of dramatic changes, Regina.

Their vertebrae and fins shifted position, their muscles changed, and with each transition, the ranks thinned.

And I would say tender work taking care of them like this.

And ultimately, around day 90, just one larva transitioned into a juvenile.

Yeah, just one.

Wow.