As I was sitting in my backyard yesterday, as I often do, watching and photographing the birds, a blue jay flew into a tree at the edge of the yard. Blue jays are very intelligent birds. Did you know that they can mimic the calls of other birds? This particular blue jay made the call of a red-tailed hawk. Blue jays often imitate hawk calls, especially that of the red-tailed hawk. But what is the usefulness of this? I witnessed firsthand how effective…