• Montezuma Castle's prehistoric dwelling

    Montezuma Castle

    National Monument Arizona

Insects, Spiders, Centipedes, Millipedes

Tarantula near the outlet at Montezuma Well.

A desert tarantula near the outlet at Montezuma Well.

NPS image by Robb Hannawacker.

Hundreds of species of insects, arachnids and other invertebrates find a home in the unique ecosystems of Montezuma Castle National Monument. These include harmless tarantulas as well as highly venomous black widow spiders and bark scorpions. However, these often misunderstoood desert inhabitants pose little threat to humans. The invertebrates found at Montezuma Castle and Montezuma Well reveal extraordinary evolutionary adaptations for survival in an arid desert environment.

Did You Know?

1968 Divers at MOWE

Groups of divers have explored Montezuma Well nine times. This picture from 1968 shows one of the first expeditions. The divers found that the Well is 55ft deep with fissures for springs reaching 120 and 140ft deep.