A small, slender gray shag, with a slender bill, yellow legs and feet, and small dark spots on its shoulder and wing feathers. Feeds, roosts, and breeds around rocky shorelines of the Chatham Islands. The Chatham Islands Shag and the Great Cormorant are the only two similar species with overlapping range, distinguished by the white upper wing patch on the Chatham Islands Shag and the much darker overall appearance and larger size of the Great Cormorant. The Pitt Island Shag is the only shag found on the Chatham islands to have yellow legs and feet.