In the present paper, an example of the communal use of one and the same nest by two "pairs" of the Bengalee, Lonchura striata var. domestica, was described. There was no marked aggressiveness between the pairs. Six eggs laid by the two females were indiscriminately incubated. The eggs did not hatch, but a nestling inserted as replacement for the eggs was normally cared for by every member of the four. Shortly speaking, these birds performed all activities including nest building, incubation, and brooding as an individual of a flock consisting of four birds, rather than as a member of a pair. The availability of only one ready-made nest in the cage was considered one of the most important causes of this curious outcome, in combination with the gentle temperament of the species in general.