Author: Alexander (Alex) Bickers

Alex Bickers is a conservation professional and volunteer Content Creator & Program Assistant for Get Outdoors Arizona, where he helps research and create newsletter content, business spotlights, and stories that connect people to the outdoors. His background includes supervisory roles at animal sanctuaries and zoos, contributing to high standards of animal welfare and conservation. Alex is dedicated to protecting wildlife and wild lands.

If you're ever outside on a warm day, spending time around flowering plants like mesquite trees or milkweed, you may find yourself face-to-face with quite the unusual sight: a two-inch-long insect with a gorgeous blue-black iridescent body, rusty orange wings, straight or curled antennae, and long legs that gracefully dangle beneath it as it flies through the air. With beautiful features like these, one could be forgiven for mistaking this animal for a fairy.

...Well, in my opinion, anyway!

Tarantula hawks, or wasps in the genera Pepsis and Hemipepsis, can be found all over our great state of Arizona. While not everyone may share my enthusiastic admiration of these creatures, there is no doubt that they play an important role in the ecosystems they inhabit.

As their name suggests, tarantula hawk wasps rely on tarantulas for their survival. Tarantulas act as the host species, and tarantula hawks are parasitoids for part of their life cycle. First, an adult female tarantula hawk searches until she finds a tarantula burrow. There, she purposefully steps along the silk at the entrance of the den to coax the spider out before attacking. The wasp then delivers a sting that paralyzes the spider. Once immobilized, she drags it into the burrow, lays a single egg on its abdomen, and covers the entrance before leaving.

Once the larva hatches, it slowly consumes the paralyzed tarantula over the course of several weeks, eating around the vital organs at first to keep the spider alive while it feeds. Eventually, the spider dies, and the larva spins a silk cocoon in which it pupates into an adult wasp.

Despite their carnivorous larval stage, adult tarantula hawks feed on pollen and nectar, acting as important pollinators as they move between blooms of flowers.  In fact, tarantula hawk wasps are one of this region's main pollinators of milkweed, which happens to be the only plant on which monarch butterflies will lay their eggs and monarch caterpillars will feed upon.  Tarantula hawks may not be primary drivers of monarch populations, but still, who would have thought that a parasitic wasp could have any positive impact on an endangered butterfly?

Now, given their massive size and a name like "tarantula hawk," it's understandable why some people find these wasps to be intimidating. In fact, although males cannot sting, the sting of the female tarantula hawk is considered one of the most painful in the insect world. The good news is that these wasps tend to be incredibly docile, and a sting from one is rare. These wasps are also solitary, so you do not have to worry about bumping into a nest.

Tarantula hawk wasps are unfortunately one of the many misunderstood animals in this region. Despite their powerful sting, they have so much beauty and value to offer. Like many pollinators, they are threatened by pesticide use and habitat destruction. Planting some of their favorite plants, such as mesquite and milkweed, can help these insects thrive, along with supporting healthy habitats for the tarantulas they depend on. Because wasps of all types tend to get a bad reputation, simply caring about these animals and encouraging others to appreciate them is important conservation work.

Tarantula hawk wasps are one of the most unique and divisive animals in the American Southwest. Some people fear them, while others are eager to catch a glimpse, but one thing is for certain: this would not be home without them.

Sources:

“Pepsis Wasp.” Arizona-Sonora Desert Museum, www.desertmuseum.org/kids/facts/?animal=Pepsis+Wasp

Benson, Z., et al. “Tarantula Hawks of Colorado: CSU Extension.” Colorado State University Office of Engagement and Extension, Aug. 2025, extension.colostate.edu/resource/tarantula-hawks-of-colorado/

“Monarch." U.S. Fish & Wildlife Service, www.fws.gov/species/monarch-danaus-plexippus