Science Early Warning Signs of Population Collapse by Gary Kopycinski on April 11, 2013 Gary Kopycinski Author More in Science: Wilmington Man’s Photo of Rare Snowy Egret Wins Forest Preserve Photo Contest June 8, 2026 Cook County Announces Free 2026 Vets and Pets Rabies Vaccine and Microchip Clinics May 30, 2026 On Hantavirus, Park Forest Officials Urge Caution May 18, 2026 Spatial measurements of population density could reveal when threatened natural populations are in danger of crashing