IT’S A CERTAIN SIGN OF SUMMER, AND IT ISN’T PRETTY. The various male green frogs (Rana clamitans) out back are engaged in hand-to-hand (webbed-foot-to-webbed-foot?) combat, trying to prove who’s top frog. Meantime, because it finally started raining after a very dry spring, their larger, truly aquatic cousins the bullfrogs (Rana catesbeiana) slipped out the back on a storm the other night, as if I hadn’t made them feel at home. What’s up with that? Remember the A Way to Garden frogfights of 2009, one of my favorite slideshows, and the Great Bullfrog Exodus? Here we go again: ribbit, er, I mean repeat.