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Salticidae, Siler cupreus
2~5 mm in length.
This one was in short grass.
The one in the picture is striking a defensive posture, probably in response to seeing its reflection in my lens. With 500 genera and 5,000 species, it's very difficult to ID a Salticidae. They make up approx. 13% of all spider species. Update: Thanks for your help IDing these, ChunXingWong!