There is no definitive answer to this question as it depends on a number of factors, including the specific definition of "biodiversity" being used. However, some experts believe that the rainforests of Central and South America have the highest biodiversity levels in North America. These regions are home to a huge variety of plant and animal species, many of which are found nowhere else on Earth.
The Amazon rainforest, in particular, is thought to be one of the most biodiverse places on the planet. It covers an area of around 5 million square kilometers (1.9 million square miles) and contains an estimated 10% of all known plant and animal species. The sheer size and variety of habitats within the Amazonian rainforest means that it supports an incredible range of biodiversity. For example, there are more than 1,300 species of mammals alone â€“ including jaguars, sloths, tapirs, and monkeys â€“ while there are also around 2.5 million different types of insects!