Our hedge is a really thick cedar hedge. The birds all love it because it provides shelter from weather. However, those thick branches also provide a kind of easy access highway for the neighborhood cats. the adults are allright, they fly a couple branches over and play catch-me-if-you-can, staying just out of reach. Babies are helpless though, until they learn to fly. The adults did a pretty good job of defending their babies despite that, one even made it to the point of fledging, but then we saw the adults with no baby