A DISCOVERY WORTH SHARING❋Nature & Animals↗ Many extinctions may go unnoticed Estimates of extinction rates are hampered by the fact that most extinctions are probably happening without being observed. The extinction of a bird or mammal is often noticed by humans, especially if it has been hunted or used in some other way. THERE’S MORE TO DISCOVERReady for another?One small break. A fresh perspective.Get today's Breakfact ↗ OpenStax · Biology 2e · Preserving Biodiversity ↗ (opens in a new tab)Share ↗