Into each garden a little critter must call. It’s a gardening given - if you plant it, they will come. But you’re not totally defenseless. Mona Zemsky, from Bird-X, Inc. helped us out a few weeks ago with some tips on repelling birds, so you could actually enjoy those blueberries you nursed along all season. Now she’s passing along some tips her company has picked up to foil everything from larcenous squirrels to digging raccoons and armadillos to - dare I say the word? - deer. So if you’ve ever wondered what all those products and gadgets were in the pest control aisle and which one to use for which pest, here’s a primer on how to control four-legged pests in the garden and home.