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The Blue-Gray Gnatcatcher (Polioptile caerulea) is a song bird which lets out a loud shrill when it is calling out to other birds or trying to scare away intruders from their nesting and foraging areas. It is mostly grayish with a white underbelly. It flicks it’s tail back and forth trying to scare small insects and spiders from their hiding places to eat. They are common in forests with a lot of dense tree cover like the one where I saw this one at the Six Mile Cypress Slough in Ft. Myers. This wetland park with a great 1.2 mile boardwalk to view a swampland and forest is also on the Great Florida Birding Trail. The Gnatcatcher quickly flies from tree to tree and is hard to photograph. The second picture in this post is of the bird swinging it’s tail back and forth. There are many other small birds in this swampland and wet forest which allows these small birds plenty of places to build nests and small insects to feed upon. The All About Birds website has some good additional information about the Blue Gray Gnatcatcher.