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An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to separate a fire ant (Solenopsis macdonaghi) from her nestmates. Lone ants make easier targets. Parque Nacional El Palmar, Entre Rios, Argentina
Solenopsis macdonaghi fire ants attacked by a Pseudacteon ant-decapitating fly. Parque Nacional El Palmar, Entre Rios, Argentina
Aphidius ervi - biocontrol wasp attacking Acyrthosiphon pisum pea aphids. Laboratory colony at the University of Arizona
One of the defenses fire ants (Solenopsis sp.) employ against parasitic phorid flies (Pseudacteon sp.) is to hide. It is thought that the effectiveness of the flies in controlling pest fire ant populations is due more to disruption of the ants' normal foraging behavior than to the parasitism itself. Parque Nacional El Palmar, Entre Rios, Argentina
An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to oviposit on a fire ant (Solenopsis macdonaghi). Parque Nacional El Palmar, Entre Rios, Argentina
An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to separate a fire ant (Solenopsis macdonaghi) from her nestmates. Lone ants make easier targets. Parque Nacional El Palmar, Argentina
In ant battles, large size is not as advantageous as large numbers. This Pheidole soldier ant proved no match for the hordes of Tetramorium sericeiventre that zealously defend their territory against any incursion. St. Lucia, KZN, South Africa
Wham! A parasitic phorid fly (Pseudacteon) plants her ovipositor between the abdominal sclerites of a Linepithema oblongum worker ant to lay her egg. The oviposition takes less than a second. The hapless ant will later be consumed alive by the developing fly larva. Termas de Reyes, Jujuy, Argentina
A harvester ant (Pogonomyrmex desertorum) wanders too close to a nest of little Forelius mccooki ants, who harass the intruder until she leaves. Tucson, Arizona, USA
In ant battles, large size is not as advantageous as large numbers. This Pheidole soldier ant proved no match for the hordes of Tetramorium sericeiventre that zealously defend their territory against any incursion.

St. Lucia, KZN, South Africa
In ant battles, large size is not as advantageous as large numbers. This Pheidole soldier ant proved no match for the hordes of Tetramorium sericeiventre that zealously defend their territory against any incursion. St. Lucia, KZN, South Africa
In ant battles, large size is not as advantageous as large numbers. This Pheidole soldier ant proved no match for the hordes of Tetramorium sericeiventre that zealously defend their territory against any incursion.

St. Lucia, KZN, South Africa
See photo in original gallery.
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all images and text © Alex Wild 2001-2013