A Flea Beetle (Phyllotreta sp.)

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Beetle Taxonomy

Flea beetle - Wikipedia
Phyllotreta - BugGuide

I found this flea beetle on February 2, 2017. It is in the genus Phyllotreta, in which there are multiple black beetles that look a lot like this one. They tend to eat brassicas (kale, cabbage, broccoli, collards, etc.) of which I have many in my garden. These beetles are all tiny, under 2mm long. I found this one when what I thought was a speck of dirt moved.

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Here is the same flea beetle in action.