Okay, they're not mine, but we watch them raise at least one batch of babies every year and I have helped them rescue some of their babies in the past. They built their second nest this year in one of the crape myrtles that our cat loves to climb. She discovered the nest this morning, but thankfully I stopped her before she made it all the way up the tree. The mocking birds keep dive bombing her, but she isn't catching the hint. Does anybody have ideas of things I can use to deter the cat?