Spiny-backed Orbweaver (Gasteracantha cancriformis)

Despite their menacing, spiked appearance, Spiny-backed Orbweavers are completely harmless to humans. They are not aggressive, and their fangs are too small to effectively pierce human skin.

*Gasteracantha cancriformis* is a very small spider, typically only about 5 to 9 millimeters wide, that features a crab-like, hardened abdomen. The females are most recognizable by their bright yellow or white coloring, distinct black spots, and six prominent red or black spines protruding from their backs.

This species is incredibly common throughout the Americas, ranging from the southern United States down to Argentina. They prefer humid environments and are frequently found building their orb webs in trees, bushes, and around residential porches.

Biologists believe the hardened carapace covered in prominent spines serves as an evolutionary defense mechanism against predators like birds and lizards. The sharp spines and tough exterior make the spider very difficult to swallow or consume.