At work recently, I was alerted to the presence of an odd wasp, with a ‘sac’ under its body, trying to get into a small hole in the window frame. I grabbed my camera, opened the window, and took photos.
It quickly became clear that the ‘sac’ was a spider, and not a tiny one either. What was less clear was whether the wasp would succeed in its quest. I assume the hole is a drainage outlet, but what the wasp was up to was less clear. A little research cleared that up.
The wasp is a Yellow-legged Mud-dauber Wasp (Sceliphron caementarium). Not sure what kind of spider it is, but I do know its days are numbered. Sadly for the spider, it will not be a swift end. According to Wikipedia, “After building a cell of the nest, the female wasp captures several spiders. The captured prey are stung and paralyzed before being placed in the nest (usually 6-15 per cell), and then a single egg is deposited on the prey within each cell. The wasp then seals the cell with a thick mud plug. After finishing a series of cells, she leaves and does not return.” Notice that the spider is paralyzed, not dead. Got to have fresh food for the kids!
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