A vinegar fly (Drosophilidae) circles in to land on a shelf fungus. 

Cape Tribulation, Queensland, Australia
Larvae of syrphid flies in the genus Microdon are so odd that they were originally described as molluscs.  The adults are more or less normal-looking flies, but larvae are predators of ant brood, living within the dark galleries of ant nests (in this case, with Linepithema oblongum).

Termas de Reyes, Jujuy, Argentina
An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch.  If the fly can catch an ant, she will force the ant to feed her.

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An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch.  If the fly can catch an ant, she will force the ant to feed her.

St. Lucia, KZN, South Africa
An ant-mugging fly (Milichia patrizii) forces a Crematogaster ant to give up her food stores.  South Africa.

St. Lucia, KZN, South Africa
Larvae of syrphid flies in the genus Microdon are so odd that they were originally described as molluscs.  The adults are more or less normal-looking flies, but larvae are predators of ant brood, living within the dark galleries of ant nests (in this case, with Linepithema oblongum).

Termas de Reyes, Jujuy, Argentina
A predatory syrphid fly larva sneaks up behind an oleander aphid (Aphis nerii) for a quick snack.  Syrphids are excellent control agents for pest aphids.  Arizona.

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Flies are among the most important pollinators.  Here, an Eristalis drone fly (Syrphidae) visits a Prunus flower. California.

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A hover fly (Syrphidae) visits a flower.

Sagehen Creek, California, USA
An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch. If the fly can catch an ant, she will force the ant to feed her.

St. Lucia, KZN, South Africa
An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch.  If the fly can catch an ant, she will force the ant to feed her.

St. Lucia, KZN, South Africa
An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch. If the fly can catch an ant, she will force the ant to feed her.

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