>Beavers prevent carbon dioxide buildup inside their lodges by leaving a vent hole in the roof
. During the construction of the lodge, beavers plaster the walls with mud for insulation and structural integrity, but they deliberately leave a small gap at the top to serve as a chimney.
Not enough is said about instinct. It is something we cannot really know about, it is knowledge proof. Something which happens and we can only document, and this goes for all species including us.

What is human instinct building right now that we are unaware of?