Also , Anchiornis had long legs , usually an indication of a strong runner . However , the extensive leg feathers indicate that long legs may be an vestigial trait , because running animals tend to have reduced , not increased , hair or feathers on their legs . Also like other troodontids , Anchiornis had very long legs , usually an indication that it was a strong runner ( however , the extensive leg feathers indicate that this may be a vestigial trait , as running animals tend to have reduced , not increased , hair or feathers on their legs ) .