Ginkgo (Ginkgo biloba) is a long-lived tree, and the species itself is a "living fossil"—it first evolved around the same time as the dinosaurs, over 200 million years ago. Unlike other tree families, like oaks and maples, that include hundreds of species, ginkgos are the only surviving species in their family. Ginkgo is one of the most commonly cultivated trees, thriving in city parkways and gardens around the world. This is because of its incredible tolerance to urban conditions such as air pollution, poor soils, salt spray, and compacted soil. This is surprising, considering that it is actually endangered in its native range in China. The trees are slow growing and slow to reproduce, and its habitat is being destroyed by human activity.