Certhia familiaris, commonly known as the Eurasian treecreeper, is a small bird found across Europe and parts of Asia. It has a slender body, a long tail, and a distinctive brown and white plumage that helps it blend into tree bark. This bird is known for its unique climbing ability, moving vertically up tree trunks in search of insects and larvae hidden in the crevices. The Eurasian treecreeper has a specialized curved bill that aids in foraging. It typically nests in tree cavities, laying a clutch of 5 to 7 eggs. This species is often heard before it is seen, as it produces a series of high-pitched calls while foraging in its woodland habitat.