File:Red field ants - Formica incerta, visiting microscopic nectar glands on the petioles of Maximillian sunflower - Helianthus maximillianii James Trager.jpg

Red field ants, Formica incerta, visiting microscopic nectar glands on the petioles of Maximillian sunflower, Helianthus maximillianii.

Photo by James Trager.