Why do swarms happen?
I've always been curious about swarms. You see them in movies or sometimes even in real life, a group of insects, usually bees, moving together as if they're one entity. But what causes this behavior? Why do they suddenly decide to leave their homes and travel together in such large numbers?
How long do swarms last?
I'm wondering how long swarms typically persist. I'm curious about the duration of these events and want to know how long they usually last.