The Red-breasted Nuthatch (Sitta canadensis) is a fun, high energy bird we usually see in northern Illinois from late fall through early spring. Rarely, we even find them during the summer months.
The Red-breasted Nuthatch applies sticky conifer resin globules to the entrance of its nest hole. It may carry the resin in its bill or on pieces of bark that it uses as an applicator. The male puts the resin primarily around the outside of the hole while the female puts it around the inside. The resin may help to keep out predators or competitors. The nuthatch avoids the resin by diving directly through the hole. – The Cornell Lab of Ornithology