Ecology (2) Reproduction (2) Life (2) Earth (Planet) (2) Birds (2) Average (2) Reproducción (2) Écologie (2) Moyenne (2) Terre (2) Vie (2) Oiseaux (2) Reproduction (2) Écologie (2) vie (2) terre (2) écologie (2) Algérie (2) Alger (1) Density (1) Preservation (1) Conservation (1) Assaying (1) Communication (1) Couples (1) Nineteen sixties (1) Crops--Phenology (1) Wealth (1) Views (1) Turtledove (1)