Even though this dude was on the kitchen window screen, inside my house, it didn't prevent it from catching and dinning on a meal! Perhaps, it was a take out meal and it accidently flew in the house when I opened the screen door to water Trixie.
This is a Robber Fly, also called an Assassin Flies, and it had some sort of bee in it's grasp. They use their sharp, pointy mouthparts, called a proboscis, to pierce their prey and inject a combination of neurotoxins and digestive enzymes. These toxins paralyze the victim, while the enzymes begin to break down its internal tissues. The robber fly then sucks up the liquefied contents of its prey.
I left the dude alone and didn't bother it, after all I don't like to be interrupted when eating either. The following morning the dead bee was on the window sill and it did actually look as if it had been sucked dry.
The Robber Fly was also still there on the screen, so I gently grabbed it and set it free outside. The slim, pruned up bee, well it went in the trash can.
The circle of life...
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