1Pacific Loon (Gavia pacifica) (left) and Common Loon (Gavia immer) This distant digiscoping photo shows both a common loon (on the right) and a Pacific loon (on the left) as a birder might see them in the field. Although they were small and distant, differences between the species can be seen. The common loon is larger and has a heavier bill. The Pacific loon is smaller, has a thinner bill, and a whiter neck and breast. This pair was photographed at Cayuga Lake in western New York State on Feb 11, 2006. Pacific loons are quite rare in New York State.
2Red-throated Loon (Gavia stellata) Nonbreeding Adult Photogaphed at the Irondequoit Bay outlet near Rochester, NY on March 13, 2015.