Are passenger pigeons extinct

Yes, the last bird named "Martha" died on September 1, 1914 in the Cincinnati Zoo. The last wild birds died out by 1900. Before this a single flock was said to blacken the sky with birds for days, and a nesting colony in the northeast American forests, could be 20 miles across, and the sheer weight of the birds in the trees could break branches from the trunks of the trees. For more details please see sites listed below.