Ah, summertime in Marin! Long, sunny days, backyard barbecues and, unfortunately, those uninvited guests at the picnic table: yellowjackets. These striped speedsters seem to have an uncanny knack for sniffing out your sandwich and making a beeline for your lemonade. But before you reach for the swatter, let’s take a step back and consider the bigger picture. Yellowjackets aren’t just party crashers — they’re also hardworking members of our local ecosystem.