A Great shearwater (Ardenna gravis; lowest bird, with white collar), a species with a normal range in the North Atlantic, sighted among a flock of Buller's and pink-footed shearwaters flying above the Pacific Ocean off the central coast of California in 2013. Sightings like this one have increased over the last few years. With the recent opening of the Northwest Passage in the Arctic due to melting sea ice barriers, researchers have noted increasing observations of Atlantic and Pacific species exchanging between the two ocean basins and are calling for the scientific community and citizen scientists to work together to systematically monitor potential migration through the newly opened waterway.