Owners can recognize signs of stress in birds during holiday activities by observing changes in behavior and physical signs. Stress indicators include feather plucking, aggression, changes in vocalization, lethargy, and decreased appetite. Birds may also exhibit repetitive behaviors such as pacing or head bobbing. Sudden retreat from interaction or increased sensitivity to noise and movement can also signify stress. It's essential to monitor your bird closely for these signs and provide a quiet, secure environment to retreat to if the festivities become overwhelming, ensuring a stress-free holiday season for your feathered friend.