There is evidence of Tyrannosaurus rex activity near redwoods as well. No animals have been seen feeding on these trees yet, and the trees are likely too large to be significantly damaged by any other than the very largest dinosaurs.
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There is evidence that coast redwoods have existed as far back as 65 million years ago. This was the end of the Cretaceous period, the last time that dinosaurs, like Tyrannosaurus rex, Triceratops, and Velociraptor roamed the earth.
In a way, all three species of redwood in existence today are living fossils. They date to the Jurassic period, when redwoods dominated Northern Hemisphere forests. Apart from China's dawn redwood, only the coast redwood and its cousin, the giant sequoia, survive—both in California.
Many specimens have a verified age over 2,000 years and some of the oldest-known redwoods are over 3,000 years old. Redwoods are considered the second oldest trees after bristlecone pines, which are 5,000 years old.
Over the hundreds or thousands of years that a redwood may live, even moderate growth adds up. The evolutionary driver of bigness in redwoods may be the advantage in being good at survival. Or it may be simply be that being taller means better access to sunlight in the dark forest.
Some of the modern-day threats to redwoods include climate change; human land uses not compatible with forest health (such as development and conversion to vineyards); intense fires; people's increasing detachment from nature; illegal marijuana cultivation; and burl poaching.
Today, the last giant sequoia on Earth live on land about the size of Cleveland (48,000 acres), in about 73 groves scattered along the western slopes of the Sierra Nevada. The northernmost sequoia grow in Placer County in Tahoe National Forest, and the southernmost groves live in Giant Sequoia National Monument.
Oldest Trees in the WorldMethuselah is a Great Basin bristlecone pine (pinus longaeva) that is currently, as of this writing, a mind-bending 4,854 years old. Its exact location is kept secret for its safety, but it lies somewhere among the aptly named Methuselah Grove in the White Mountains of eastern California.