Here's why:

* Luxuriant ecosystem: Biodiversity hotspots are known for their rich and diverse ecosystems, often with high levels of endemic species.

* Home to half of animal and plant species: Biodiversity hotspots are defined as areas that harbor at least 1,500 endemic vascular plants and have lost at least 70% of their original habitat. This means they hold a significant proportion of the world's biodiversity.

Other relevant terms:

* Megadiversity countries: Countries with a particularly high number of species.

* Endemic species: Species that are found only in a specific geographic area.

* Habitat loss: The destruction or degradation of natural habitats, a major threat to biodiversity hotspots.

Let me know if you have any other questions!