Ladybugs cluster together on leaves along the Stream Trail at the Reinhardt Redwood Regional Park in the Oakland Hills. (Photo by Dan Rosenheim)

Walking down an East Bay hills trail in February, you might at first think you saw an odd rust covering much of the trailside vegetation. 

But then you will notice that the “rust” appears to be moving, and closer inspection reveals that this is not rust at all, but ladybugs — tens upon tens of thousands of them — emerging to mate after a long winter rest.

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