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For Insects, Spiders & Their Kin
For the United States & Canada
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Calendar
BugGuide Gathering
Smoky Mountains
University of Tennessee Biological Field Station
August 8-10, 2008
 
Photos from the gathering
 
Photos from the 2007 gathering in Minnesota

Do Robberflies bite/sting humans?

I'm wondering if Robberflies bite. In particular, Proctacanthus milbertii has a nasty looking lance under his chin that looks quite capable.

Also, do Robberflys inject a venom into their prey?

....Ed Johnson....

Robber fly kills bird
Eleven days after Ed Johnson posted this near miss he observed a Mallophora successfully kill a hummingbird. Thanks to Eric Fisher for the link.

Yes.
If handled roughly, robber flies (at least the larger ones) can inflict a painful bite. They practice "extraoral digestion," which means they shoot enzymes into their prey to pre-digest it by liquifying the tissues. Would probably destroy human tissue a little bit as well. They probably do inject a venom as well, to stop their prey from struggling, accounting for how some can bring down large grasshoppers, or even dragonflies!

 
Thanks
Thanks, Eric.

I saw a Mallophora leschenaulti (Beelzebub Bee-eater) attack and chase a Hummingbird today! Fortunately, he never did make contact and the hummingbird could fly faster than the huge robber and got away. We've had a number of these Mallophora around my place in the Texas Hill Country lately.

....Ed....

 
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I'm the "predator defender".
Without them, the animals they eat become less healthy. Predators are possibly the most important animals to have around. It can be sad to see them catch a "cute" animal meal, but those cutties need it in the long run.
(BTW: hummingbirds kill thousands of bugs in their life)

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