Pando (tree)
Humans brought mule deer into the region, which may be a threat to Pando. On the other hand, aspens are resistant to browsing: their leaves contain some unpleasant chemicals. In a study done in the 2000s, scientists analyzed aerial photographs of the region. They found that Pando has not grown in size in the last 30–40 years. Therefore, they say that it may be threatened.