All the information is here,pixeljoint.com/2024/07/10/6988/Group_Picture_2024_Animal_Atlas.htm

As for more information as to what animals have been chosen and stuff, you can find the pixel joint discord under the community tab at the top  👍

Where do I find this challenge? Im curious what all the animals for the challenge are or how it works?

Thank you for your lovely comment, you have added a crazy amount of detail on your bat too though with the little feet and wing shading 

I don't understand how you people can take such tiny canvases and fill your subjects with so much detail! Transparent veiny wings, pollen on tiny back legs, this is just precious