Bunnies vs. the Birds

Disaster is brewing in the backyard. The bunnies suspect some birds I've been trying to get as tenants of sneaking around and eating their tomato plants. They have noticed some have gone missing, and they've seen digging in their tomato bed. Granted, the bunnies didn't find any bird claw prints, but they're sure it was them, and they're royally ticked. They're talking about taking shifts standing guard in the backyard to protect their plants, and work on that scarecrow is going ahead full steam. They're talking about slingshots and water balloons next if the birds don't get lost! What do I do? I need those birds for my business, but the bunnies can make my life miserable if they lose more plants!