The Great Crested Flycatcher (Myiarchus crinitus) announces its presence with a loud, clear wheep or rolling crrreep. It always nests in a cavity – an abandoned woodpecker hole, a hollow tree, or a nest box. If the hole is too deep, the birds will fill it up from the bottom with debris before beginning the nest of twigs.
They may add a cast-off snakeskin or a strip of shiny plastic, which is sometimes left hanging outside the cavity. In dry parts of the West, the smaller Ash-throated Flycatcher (Myiarchus cinerascens) often nests in a hole in a large cactus. The species can be found in forests and clusters of trees.