Why don't other animals have religion, or do they?

[KungKras]

Well, in skinnerbox experiments, Pidgeons developed superstitious behavior.

About how advanced humans were when they invented religion. At the very early times, religion were simply stories that were passed on among generations, it was inseparable from culture at the time, and when they got passed on and grew more fantastical, people took them more seriously. That's how I rekcon it emerged.