Conservation International (CI) is a non-profit organization that works to protect biodiversity and promote sustainable development. It has identified and designated 36 biodiversity hotspots around the world.

Biodiversity hotspots cover only about 1% of the Earth's land surface, but they contain a disproportionately high number of plant and animal species.

Madagascar is home to over 10,000 endemic plant species, more than any other biodiversity hotspot.

The Andes is home to over 1,800 endemic bird species, more than any other biodiversity hotspot.

Madagascar is home to over 100 endemic mammal species, more than any other biodiversity hotspot.

Madagascar is home to over 200 endemic amphibian species, more than any other biodiversity hotspot.

Madagascar is home to over 300 endemic reptile species, more than any other biodiversity hotspot.

The Philippines is home to over 2,000 endemic fish species, more than any other biodiversity hotspot.

Sundaland is home to over 15,000 endemic invertebrate species, more than any other biodiversity hotspot.

Madagascar is home to over 1,000 threatened species, more than any other biodiversity hotspot.

Brazil's Atlantic Forest has lost over 85% of its original cover, making it one of the most threatened biodiversity hotspots in the world.

Sundaland is facing significant threats from climate change, as rising sea levels are inundating coastal areas and changing weather patterns are disrupting ecosystems.

The Philippines is facing significant threats from pollution, as industrial and agricultural activities are releasing harmful chemicals into the environment.

Hawaii is facing significant threats from invasive species, as introduced plants and animals are outcompeting native species for resources.

The number of endemic species is the most important factor to consider when identifying biodiversity hotspots, as it indicates the level of unique biodiversity in an area.