|Great crested flycatcher nest with snake skin - the transient biologist|
|Tufted titmouse - Joe Motto|
Research has shown that they may also serve as a predator deterrent as well, similar to a house sign warning that there is a burglar alarm inside. The Tufted Titmouse will incorporate bits of snake skin in its nest while a Great Crested Flycatcher may use a whole snake skin lining the nest with some hanging over the edges to show on the outside. This flycatcher's eggs are frequently eaten by flying squirrels and rat snakes will take the eggs, the flycatcher and even the flying squirrel that is predating the nest.
So does the snake skin work as a deterrent? A study described in Birds.com describes the proof.
"A test carried out by the researchers confirmed that to be so. Using 60 nest boxes in which quail eggs were placed, researchers added snake skins into 40 of the boxes, with 20 boxes having no snake skin in them. All of the 40 boxes with snake skins were left untouched, while up to 20 percent of the nests without snake skins were raided by flying squirrels – evidence that some birds use snake skins specifically to ward off predators, and it appears to work."If only a Black Rat Snake skin would deter the pack rats in our house!