Talk:Storyline/@comment-30738797-20180527003743/@comment-35881450-20180614193736

Scientifically, what would make the most sense is that the peepers have learned to do this through natural selection. As the other peepers died, some of them must have been accidentally  sucked in through the pipes, and aquired some of the enzymes, saving them. They would learn that, as long as they frequently visited the aquarium, they would not die. They would also carry some residual enzymes to the surface on these "trips", possibly (accidentally) saving some carnivores preying on them in the process. The carnivores would a) provide fertilizer for the local flora, feeding the healthy population of peepers, and b) cull the number of rapidly monopolizing peepers to a healthy level. The peeper population would (through natural selection) develop their "present day" expulsion systems, allowing them to enjoy the positive effects of having carnivores without the negative effect of being eaten.

I have way too much time on my hands...