...a mammal, a tree, a coral, a fungus, an insect or a sponge (or any one of a gazillion other forms that life takes).
They can be found in near-to boiling water, sulphurous sludge, frozen wastelands, underground rivers, spiny forests, perilous cliffs or living almost all their life in mid-air.
In this section we present fact sheets on a selection of species that WWF is working to protect, either directly or indirectly, through its various programmes of work.
According to the IUCN (International Union for the Conservation of Nature), humans know about an estimated 1,562,663 different life forms on this planet. This includes:
Many experts feel we have still to discover many, many more species - some estimates say we have yet to discover and describe millions of 'new' lifeforms.
The IUCN maintains the red list, which lists 16,118 endangered species.
Officially, threatened species are those listed as Critically Endangered (CR), Endangered (EN) or Vulnerable (VU).
Practically this means:
More on the IUCN Category listings...
How WWF categorizes the species it works on...