Keywords: common murre; Uria aalge; nestling; colony; Northern California Current System; nCCS; diet; prey; northern anchovy; Engraulis mordax; rockfish; Sebastes; Pacific sand lance; Ammodytes hexapterus; smelt; Osmeridae; opportunistic foraging; Triangle Island, British Columbia; Tatoosh Island, Washington; Yaquina Head Outstanding Natural Area, Oregon; Devil's Slide Rock, California; Castle Rock National Wildlife...