Loggerhead Shrike (Lanius ludovicianus)
A Loggerhead in typical pose looking for prey to pounce upon. Often, after catching prey, shrikes will impale them on thorns or barbed wire for later consumption. This behaviour has led to them, in general, being given the alternative name of Butcher Bird. The Loggerhead is similar enough to the Great Grey Shrikes I've seen in Europe and Lanius excubitor does occur in North America. However, this is the only 'grey' shrike found in Florida so no real identification headaches. This one was posing near entrance to Circle Bar B Reserve.
A photo of a European Shrike is in Comment Box below for comparison.