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Aerial Yellowjacket at nest - Dolichovespula arenaria

Aerial Yellowjacket at nest - Dolichovespula arenaria
Pacifica, San Mateo County, California, USA
June 22, 2007
Are those eggs inside the nest?

Nice photo, and uncommon nest!
I'v never seen a nest of the aerial yellowjacket where the entrance hole is in the middle of the nest insted of the bottam, very unique.

Eggs would be much smaller
Those are probably closed ends of the cells where the larvae are pupating. Inside the paper nest are layers of hexagonal cells that look just like honeycombs, but made of chewed wood fiber. An egg is deposited in each cell. When it hatches the larva are fed by their older sisters till they pupate in that same cell.
We've tried to make this brief, so it's likely not every statement above is exactly correct, but you should get the idea, and someone who really knows these wonderful creatures can give you more details if you ask. (or maybe even if you don't!)

Those are not eggs, but "capped" cells. When ready to pupate, the larvae spin a silken dome over their cell. You are seeing the reflection of light off of those silken caps.

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