Tarantulas can be seen all over Texas and New Mexico pretty much anytime but right now they are really coming out in droves in what appears to be a mass migration. They aren't migrating though, they're male tarantulas trying to score.
This reminds me of the chapter in Dracula when the Demeter ... the ship Count Dracula took from Transylvania to England ... arrives in port with no living soul aboard except a dog who runs away.