Spiders of north america Today, there are about forty thousand species of spiders on our planet, and more than three thousand arachnids live in North America, some of which are extremely dangerous for humans and animals. Brachypelma Smitty Tarantula spiders from the genus Brachypelma that live on the Pacific coast in humid places and scrub. A popular species for breeding in captivity, it is large in size and brightly colored in dark brown, in places almost black. The legs have bright areas of red or orange with white or yellow edging. #RandomThoughts