7. California Floristic Province, North America
The California Floristic Province of North America has a Mediterranean-type climate. The tropical and subtropical broadleaf forests are the abode of the giant sequoia, the planet’s largest living organism, as well as its close relative, coastal redwood. The largest avian range of the US, including California condor, the largest North American bird, breeds here. Many large mammals have gone extinct. Commercial farming, alongside the expanding urban areas, pollution, and road construction, are all major threats, and barring about 10% of the habitat, have degraded the rest of the terrain.
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