The long-standing question of how animals came to have an anus may have been solved by studies of which genes are active during development in various animals
- Archived version of the article: https://archive.is/x2eUW
- The study: https://www.biorxiv.org/content/10.1101/2025.02.10.637358v1
These fellas are 100% injecting semen into anuses for science
Lungs evolved from the digestive tract as it’s more efficient to just have a separate organ for it, which is also the reason you can shoot oxygen up your butthole to breathe
So maybe this discovery will have some alternative usefulness