by Matthew Cobb

UPDATE: Matthew sent this computer-generated image of the robberfly’s venom system:

In case you didn’t know, today is World Robberfly Day on Twitter, so entomologists are posting pictures of these fabulous, chunky and aggressive flies, the apex predator of the Diptera. Go over and check out the photos yourself – here are just a few.




  1. busterggi
    Posted April 30, 2018 at 1:30 pm | Permalink

    So hard to find just the right card for this day.

  2. Posted April 30, 2018 at 1:31 pm | Permalink

    Stunning images of these amazing creatures. Thanks.

  3. Taskin
    Posted April 30, 2018 at 1:32 pm | Permalink


  4. Mark Sturtevant
    Posted April 30, 2018 at 1:55 pm | Permalink

    For once in my life I sort of wish I posted on Tweeter. Got two interesting pictures of robber flies being bad-ass.

  5. Posted April 30, 2018 at 2:15 pm | Permalink

    Poor odonates!

  6. Posted April 30, 2018 at 2:33 pm | Permalink


  7. Posted April 30, 2018 at 3:32 pm | Permalink

    When I was 15, our family was on vacation and at a campground in north central Pennsylvania. I was wearing a sweatshirt. I bent over and a robberfly must have used that moment to land on my back. When I straightened up, its feet got tangled in the fabric and it bit me through the sweatshirt. Ouch! Worse than a horsefly bite. I would hate to be bitten on my bare skin by a robber fly.

  8. Mark R.
    Posted April 30, 2018 at 4:03 pm | Permalink

    The eyes are mesmerizing…I’m mesmerized.

  9. infiniteimprobabilit
    Posted April 30, 2018 at 4:31 pm | Permalink

    Surely something only an entomologist could love? πŸ˜‰

    And ‘robber fly’ must be euphemism of the week. ‘Assassin fly’ or ‘killer fly’ or ‘murderer fly’ would surely be more fitting…


    • infiniteimprobabilit
      Posted April 30, 2018 at 4:33 pm | Permalink

      P.S. Insofar as some of them kill wasps, though, I guess they’re not all bad. The enemy of my enemy…


  10. Michael Fisher
    Posted April 30, 2018 at 4:52 pm | Permalink

    It is all rather wonderful. In my seventh decade [age 61] I’m beginning to appreciate, but not love, the non-furry vast majority of organisms.

    The various pictorial contributors to WEIT have done that.


  11. W.Benson
    Posted April 30, 2018 at 8:53 pm | Permalink

    Asilids are neat. Thanks for the great photos.

  12. Mobius
    Posted May 1, 2018 at 12:10 pm | Permalink

    I recall once witnessing a robberfly snatching a honey bee out of the air, falling to the ground (landing on its back for some reason) and biting the bee. The bee just seemed to deflate. Interesting, yet horrifying at a certain level.

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