You feature the seven "megadiversity" countries, which contain the largest number of species of plants and animals and where the extinction crisis is most severe.

We're on the verge of an extinction crisis, wiping out millions of species by rapid loss of habitat before we even study them.

The Devonian extinction crisis primarily affected the marine community, and selectively affected shallow warm-water organisms rather than cool-water organisms.

Threatened by clearcutting and the removal of undergrowth, there have been warnings of an imminent extinction crisis.

As with many marine birds, the mancalline auks were much affected by the extinction crisis in the late Pliocene oceans.

C1 The lowly mussel faces an extinction crisis.

For example, the extent of human disturbances, including habitat destruction, in the Atlantic Forest has led to an extinction crisis.

The first programme asks if there really is an extinction crisis facing certain species.

Explosive, unsustainable human population growth is an essential cause of the extinction crisis.

Whatever the magnitude of the extinction crisis, it is remarkable in being the only such event in the history of earth that can be consciously averted.