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" ... If you are a weather watcher in southern California, then you were recently greeted by a remarkable phenomenon when you watched the evening news: despite clear and cloudless skies overhead, local weather radar recorded a large blob, or “echo”, over the San Gabriel Mountains headed down towards San Diego. This echo looked like a giant raincloud. Except it wasn’t: it turned out that this weather radar echo was a swarm of lady beetles that measured roughly 80 miles by 80 miles. ... "