위키 홈 Edit 기원전 40세기 2025-07-26 (modified: 2025-08-22) ← 41st century BCE → 39th century BCE ↑ 4th millennium BCE 오리의 가축화 Decades 3900s BCE 3910s BCE 3920s BCE 3930s BCE 3940s BCE 3950s BCE 3960s BCE 3970s BCE 3980s BCE 3990s BCE