Professor Zhang: Since the 1980s, the number of Spotted owls has declined sharply, and they are now in danger of extinction  Timber harvesting companies are to blame for this, harvesting large amounts of old woodland that is home to owls  Researcher Li: The decline of the Spotted owl population cannot be blamed on timber harvesting companies
Question Professor Zhang's assumption that owls can only survive in old forests
 For the last 30 years, a more prolific species of striped owl has entered old forests to compete with Spotted owls for resources