Sphecius convallis feeding on sap at a willow tree, along with several flies. Note the foam in the wound in the tree’s bark, probably made by yeast sugar fermentation.

  Part of: Coelho JR, Hastings JM, Holliday CW (2020) Nesting ecology of the Pacific cicada killer, Sphecius convallis Patton (Hymenoptera, Crabronidae), in the Sonoran Desert. Journal of Hymenoptera Research 80: 177-191. https://doi.org/10.3897/jhr.80.59206