👉 Nest fluid, also known as brood material or nest lining, is a specialized secretion produced by certain bird species to line their nests. This fluid serves multiple purposes: it helps insulate and cushion the eggs and chicks, protecting them from temperature fluctuations and physical damage. Additionally, nest fluid can contain antimicrobial properties that reduce the risk of infection, and it may also play a role in camouflage, helping to conceal the nest from predators. The composition of nest fluid can vary among species, often including secretions from the uropygial gland, plant materials, and even secretions from the bird's own skin.
