In Manitoba, Canada, snow sticks around late into the year. But after six months underground, male garter snakes — impatient for spring — emerge to join a mass gathering. Thirty thousand males — the largest concentration of snakes on Earth — wait for their dates to arrive.
The larger females like to show up late, giving the boys a chance to warm up in the sun. Drenched in pheromones, they drive the males crazy. A hundred males wrap around each female, but only one will get to mate with her.