On a planet of black algae and tholin-eating bacteria, an entire ecosystem has thrived for eons, each form barely evolving into existence before it becomes something new. The YouTube playlist follows life as it leaves the water and diversifies to fill every habitat.

Organisms include reefs of sponges with skeletons of methane hydrate, seed squirters, pollinators that use psychoactive drugs, cannibalistic swimming inchworms, floaters, spiny gliders, cups of silk bacteria, and animals with skin folded into fur. Featured subjects include chemistry and communication.

The planet Zira is home to two phyla – plants with jellyfish-like larvae, and animals with three mouths and three butts. Within these restrictions, there is more variety than one might think. There are analogues of barnacles, ammonites, and eels. Follow the continuing story of evolution on the playlist.

YouTube user ribers.moppsi is developing many worlds at once, some magical, some paranormal, but most strictly biological. The most developed world is named Syinessia. This is a planet of inverted branches. Grass-like shoots are drawn to each other by pheromones until they merge as they grow upwards. I can only imagine the tangled thickets of overlapping branches they might form and the few, tall fruiting spires above.

Animals include segmented worms with legs, spines, alternating sizes of segments, beaks, or flattened display shells, cat-like creatures with ocular plates on their gills, and amphibious creatures resembling a delightful cross between spiders and jellyfish.