Larus dominicanus,(black-backed gull,)
The southern black-backed gull (or ‘black-back’) is one of the most abundant and familiar large birds in New Zealand, although many people do not realise that the mottled brown juveniles (mistakenly called “mollyhawks”) are the same species as the immaculate adults. Found on or over all non-forested habitats from coastal waters to high-country farms, this is the only large gull found in New Zealand. They are particularly abundant at landfills, around ports and at fish-processing plants.
Known widely as ‘kelp gull’ in other countries, the same species is also common in similar latitudes around the southern hemisphere, including southern Australia, South America, southern Africa, and most subantarctic and peri-Antarctic islands, and the Antarctic Peninsula. Original public domain image from Flickr