Creating a castle
The male marsh wren builds the nest in anticipation of the arrival of the female. Sometimes they build "dummy nests" which aren't used, they are never as well completed as the ones that are used as brood nests. Some scientists theorize that they are build as an outlet for the energy of the males before the females arrive. Dummy or extra nest building stops when the females arrive and mating starts.
Creating a castle
The male marsh wren builds the nest in anticipation of the arrival of the female. Sometimes they build "dummy nests" which aren't used, they are never as well completed as the ones that are used as brood nests. Some scientists theorize that they are build as an outlet for the energy of the males before the females arrive. Dummy or extra nest building stops when the females arrive and mating starts.