A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators.
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White-water rapids is my guess, but the original website is a 404 error page, and so far the pinners I've checked haven't listed what it is, except snow. The motion doesn't seem to correlate with snow.