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Common Brown Robberfly and Horse Fly

Zosteria rosevillensis


Robber flies are powerfully built, bristly flies with short, sharp, stout sucking mouthparts. The name "robber flies" reflects their notoriously aggressive predatory habits; they feed mainly on other insects and they largely wait in ambush and catch their prey in flight. The fly attacks its prey by stabbing it with its short, strong proboscis injecting the victim with saliva containing neurotoxic and proteolytic enzymes which very rapidly paralyze the victim and soon digest the insides; the fly then sucks the liquefied material through the proboscis.


Robber flies live in urban areas, forests and woodlands.

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LeanneGardner 8 years ago

Thank you very much Brenda, Maria & Lauren :)

LaurenZarate 8 years ago

Wonderful picture!!!

Maria dB
Maria dB 8 years ago

Great shot!

LeanneGardner 8 years ago

Thanks very much Mac C :) Glad you're enjoying them.

MacChristiansen 8 years ago

Onjoying your pics Leanne, great spotting

LeanneGardner 8 years ago

Thanks YukoChartraw :)

YukoChartraw 8 years ago

Great shot and very informative!

LeanneGardner 8 years ago

Ha! Thanks Aaron, yes indeed :)

Aaron_G 8 years ago

Great photo. You got a 2-for-1 on this one for the Flies! mission. ;-)

LeanneGardner 8 years ago

Thank you Fyn :)

Fyn  Kynd
Fyn Kynd 8 years ago

Awesome shot!

Spotted by

Mackay, Queensland, Australia

Spotted on Dec 20, 2012
Submitted on Dec 22, 2012

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