Description
Tarantula spider on yellow road sign indicating possible crossings in this desert vicinity. Tarantulas are large hairy arachnids belonging to the family Theraphosidae - some growing up to 12 inches across. They are invertebrates that rely on exoskeletons for muscular support. Tarantulas mainly eat insects and other arthropods, using ambush as their method of capture. The largest tarantulas can kill lizards, mice, birds and small snakes. Two venom glands protrude in front of the forward legs that vent through fangs. The hollow fangs inject venom into prey, or as a defense mechanism. In defense, the animal will raise up on back legs as a counter-threat. Generally, a tarantula bite does not pose a serious threat to humans, however painful it may be - although occasionally infections will occur. Some of the body hairs can be shed - also as a defense mechanism - the hairs are irritating to the recipient. Other hairs on the legs aid in climbing. The resident species suggested on the sign is Aphonopelma chalcodes, commonly known as the western desert tarantula, Arizona blonde tarantula, or Mexican blonde tarantula. Sedona, Arizona, 2012.