1. Do pied flycatcher males adopt broods of widow-females?;Alatalo;Oikos,1983
2. Excess females in a breeding population of house sparrow Passer domesticus (L.);Anderson,1990
3. Bluebird revival. A heart-warming comeback from the brink of extinction;Backhouse;Can. Geogr.,1986
4. Sustainable harvesting of parrots for conservation;Beissinger,1992
5. Relative value of natural cavities and nest houses for wood ducks;Bellrose;J. Wildl. Manage.,1964