Scientists say a fixture inside California's Sierra Nevada Forests for more than two million years, might be in jeopardy.
They are concerned drought and climate change are threatening giant sequoias.
The iconic trees only grow in about 70 groves scattered over an area of about 55 square miles on the western slopes of the Sierra.
They were spared during the widespread tree mortality that recently occurred in California forests during the drought.
However, researchers working with the National Park Service recently found sequoia groves are showing signs of stress.
They fear the normally resilient trees are becoming increasingly vulnerable to multi-year droughts, which are projected to continue increasing in severity because of climate change.
Climate change threatens giant sequoias, scientists say
SEQUOIA NATIONAL FOREST