mating season? did I miss the memo?
It’s a joke about animals that try to attract the opposite sex by being loud and obnoxious (like a peacock) to try to lure a partner in during their mating season. It’s a biological trait in most species.

Humans have mating season too, it’s from January till December.

Or March till October if you live at a really high latitude and it gets so dark and depressing in the winter months that you just stay inside.