Something Jumping in our Winter Salads

Maurice and Doris (resident cats) are the prime suspects for the skullduggery in the Planters......suspicious hollows in the middle of the planters, squashed seedlings.....arghh, whats a gardener to do?
One roll of galvanised netting later, cut simply into squares and bent around the willow weave and all crops secured. I can report there has been no further activity since!