Messor pergandei is among the most commonly seen seed harvesting ants in southern California.  Colonies of this species contain worker ants of different sizes, while most other seed harvesters in the region have monomorphic workers.  Here, a major worker carries a seed back to the nest.

Anza Borrego Desert, California, USA
Predatory Euryopis spiders snatch foraging harvester ants and drag them up grass blades to feed.   Here, a spider consumes a worker Messor pergandei.

Mojave National Preserve, California, USA
A nest of Messor pergandei.

Mojave National Preserve, California, USA
A nest of Messor pergandei.

Mojave National Preserve, California, USA
Predatory Euryopis spiders snatch foraging harvester ants and drag them up grass blades to feed.   Here, a spider consumes a worker Messor pergandei.

Mojave National Preserve, California, USA
Messor pergandei workers remove an unwanted queen from their nest.  She may be an old queen who has ceased laying or a young rival to the dominant queen.

Afton Canyon, California, USA
Messor pergandei workers remove an unwanted queen from their nest.  She may be an old queen who has ceased laying or a young rival to the dominant queen.

Afton Canyon, California, USA
Messor pergandei at the nest entrance.

Afton Canyon, California, USA
Predatory Euryopis spiders snatch foraging harvester ants and drag them up grass blades to feed.   Here, a spider consumes a worker Messor pergandei.

Mojave National Preserve, California, USA
A nest of Messor pergandei.

Mojave National Preserve, California, USA
A nest of Messor pergandei.

Mojave National Preserve, California, USA
A nest of Messor pergandei.

Mojave National Preserve, California, USA
See photo in original gallery.
all images and text © Alex Wild 2001-2013