The bird makes chewing and retching movements of the bill and throat, as the saliva is regurgitated and worked around the mouth. Saliva is smeared on the edge of the nest with the sides of the bill. The nest takes shape as a pad of hardened saliva adhering to the wall. Subsequently a rim is added and material is laid down in layers until a small cup-shaped nest is finally formed.
Building the Birds' Nest
Building the Birds' Nest
Building the Birds' Nest
Building the Birds' Nest