You searched for: “nidificant
nidificant (adjective), more nidificant, most nidificant
Relating to the process of developing or producing a nest: The nidificant persistence of the two birds in finding the right materials and the assembling of their breeding place was observed and photographed by Monroe from the window of his workroom.

The nidificant habit of the sparrows seem to be to return to the previous year's habitation and repair it in time for the new breeding season.