Las Vegas has been plagued with a dense swarm of grasshoppers for the past several days, to the point they have been picked up by weather radar. Most of these grasshoppers are migrating north and will continue to swarm Las Vegas until much of them are eaten by birds and other animals.
Despite the huge numbers, grasshoppers don't necessarily pose a threat to humans though it might get annoying especially if they enter your home. FULL STORY