| These and many other animal groups perished in a cataclysmic mass extinction 65 million years ago. |
| Carnivores, species at the top of the food chain, are in danger of a mass extinction that would affect all species within their ecosystems. |
| Perhaps we can adapt to global warming, and perhaps we can survive a mass extinction even of species on land. |
| Marine fossil evidence tells of numerous extinctions, global mass extinction, and geochemical events. |
| Some biologists today believe there are signs of a sixth mass extinction, triggered by man's extensive interventions in the natural regime. |
| A million years before a mass extinction event, the corals vanish, more or less. |
