Its an easter egg that I use to hold the probe for the thermostat in my homemade bator. It works really well as it sits at the same level as the eggs. For a closer look check out my bator that I entered into the homemade incubator contest.
https://www.backyardchickens.com/web/viewblog.php?id=52303-my-homemade-incubator
https://www.backyardchickens.com/web/viewblog.php?id=52303-my-homemade-incubator