: Breeds. and Apr-Jul. Small numbers breed on a few islands near Isle au Haut. Jun-mid Sep usually immatures on ledges at the outermost parts of Frenchman Bay and Blue Hills Bay and the .
: to migrant late Sep-early Nov with early birds often in flocks of Double-crested Cormorants. Few data about spring movements but presumably mid Mar-mid Apr.
: to mid Nov-mid Mar in outer Frenchman Bay and Blue Hill Bay and the . to during the same period in the
Miscellany: Great Cormorant is a variable and nearly cosmopolitan species. The famous cormorants used by Japanese fisherman are this species.
Last Reviewed: June 2nd, 2022