Note the size of the spider. Arizona blond tarantulas, by far, are one of the largest spider species found in Arizona. Measuring 3 to 4 inches in length, it is hard to mistake this spider for anything other than a tarantula. The giant crab spider is also a larger spider, yet at its peak generally measures 2 to 2 ¼ inches in length. The wolf spider is not a large spider in terms of body size, but its long legs make it an intimidating looking species. Most adult wolf spiders have a leg span of about 2 to 2 ½ inches.
Check the spider's coloration. Giant crab spiders tend to be light to dark brown without any distinctive markings. The female blond tarantula is a muted brown color, but the males tend to be much more flashy with black legs, a rust colored thorax and an auburn abdomen. Wolf spiders have a base that is usually brown with a black to dark gray pattern on the back of the thorax.
Observe the spider's movement. Crab spiders have a very distinctive walk, choosing to sidle sideways for the most part, hence their name. Giant crab spiders do climb, despite their large size, and can be found hiding in eaves and under ceilings. Tarantulas tend to move slowly and somewhat methodically and typically stay close to their underground burrows. Wolf spiders tend to be nomads and will move quickly and with purpose. They are rarely seen near webs as they hunt by ambush.
Find the spider's habitat. Blond tarantulas are generally found in areas of Arizona where lots of saguaro catci are growing. They create dens underground, lined with web, and rarely leave them unless they are ready to mate. The Giant crab spider rarely creates a den, preferring to find sanctuary in old, rotting saguaro catci, under eaves and other protected areas. This spider does not make a web to capture prey. Instead, it chooses to actively hunt after dark. It prefers more tropical- like areas, near water sources. Wolf spiders not only do not make a web, they also do not climb, so you will only find them on the ground. Like crab spiders, they do not make a nest, but will seek shelter in existing buildings or plants. The wolf spider of Arizona prefers the Upland area of Arizona and their burrows are somewhat obvious.
Observe the prey in the area. Giant crab spiders can be found where insect prey is plentiful. Crab spiders aren't peculiar with regard to what type of insects they eat as long as they can catch them since they rely on speed and stealth instead of webs to capture them. Crab spiders are somewhat unique from other large Arizona spiders in that they have the ability to climb and can access insects that make their homes off the ground. Blond tarantuals, on the other hand, supplement thier insect fare with the occasional small lizard or rodent. Since their venom is weak, they tend to stick with prey much smaller than themselves. Wolf spiders are aggressive hunters and will prey upon almost any insect that dares venture into his turf including grasshoppers and other quick meals.
