Herring gulls tend to live and breed in coastal areas and generally only live inland in small numbers and near bodies of water. The most important habitat requirements are the nearby presence of a food source, distance from major predators, and shelter from prevailing winds. Herring gulls prefer to breed on flat ground on offshore islands, on the mainland these gulls prefer cliffs, where there is less risk of exposure to predatory mammals. Although herring gulls prefer to nest on rock or sand, highest breeding success has often been observed in birds that nest in vegetated areas. Herring gull foraging habitat is not typically the same as their nesting habitat; in coastal areas herring gulls search for food in the intertidal zone and at sea. Herring gulls are also found in coastal urban areas, nesting on roofs and eating urban refuse. ("Hinterland Who's Who", 2008; "All About Birds", 2003; Finney, et al., 2003; Goryaeva, 2007; Pierotti and Good, 1994; Rodway and Regehr, 1999)
Herring gulls are fairly large gulls. Male herring gulls range in size from 60 to 66 centimeters in length and 1050 and 1250 grams in weight, while female herring gulls range from 56 to 62 centimeters in length and 800 to 980 grams in weight. The wing span of herring gulls ranges from 137 to 146 centimeters. While male herring gulls are larger than female herring gulls, the sexes have similar plumage. Their heads and underparts are white, and they have light gray backs. Herring gulls have yellow bills with a red spot on the lower mandible and pink or flesh-colored legs. Herring gull outermost wing feathers are black and have a white spot. During winters, adult gulls have streaks of brown coloring on their heads. Adult herring gulls have golden eyes surrounded by a yellow-orange ring of skin. ("Hinterland Who's Who", 2008; "All About Birds", 2003; Pierotti and Good, 1994)
Herring gulls take four years to acquire standard adult plumage and are mottled brown during their first four years. The eyes of immature herring gulls are dark brown, rather than golden, and are surrounded by blackish skin, rather than orange-yellow. Their bills are black and their legs are dark gray. ("Hinterland Who's Who", 2008; "All About Birds", 2003; Pierotti and Good, 1994)
Herring gulls belong to a complex of gulls, all of which share similarities and may be confused with one another. Because of hybridization and other factors, the taxonomy of gulls is complicated. Great black-backed gulls (Larus marinus), are much larger than herring gulls and have a lighter bill and darker mantle. Lesser black-backed gulls (Larus fuscus) have a dark mantle and yellow legs. Both great and lesser black-backed gulls have occasionally hybridized with herring gulls. Ring-billed gulls (Larus delawarensis) are smaller than herring gulls, with yellow legs in adulthood and possessing a bill with a distinct black ring and lacking a red spot. Thayer's gulls (Larus thayeri) are quite similar to herring gulls, but adult Thayer's gulls have dark eyes and much less black coloring under the wingtip. The species status of Thayer's gulls has been questioned. They may be a form of or Iceland gulls (Larus glaucoides). California gulls (Larus californicus) have yellowish green legs, a black spot in front of the red spot on the bill, and are smaller than herring gulls. Western gulls (Larus occidentalis) are similar in size but have a darker mantle. Glaucous-winged gulls (Larus glaucescens) are similar in color but somewhat larger in size compared to herring gulls, and have pale gray rather than black wingtips in addition to a dark iris and purplish skin around their eyes. Hybrids between western gulls and glaucous-winged gulls can appear quite like herring gulls, but often with less black wingtips. Mew gulls (Larus canus) are much smaller than herring gulls and have yellow legs and unmarked yellow bills. ("Hinterland Who's Who", 2008; "All About Birds", 2003; Pierotti and Good, 1994)
Herring gulls are almost always monogamous, with rare cases of 1 male and 2 females occupying a territory and incubating 1 or 2 nests. The secondary female rarely achieves breeding success. Pairs are formed on the male's territory or in loafing areas. Males and females choose territory for egg-laying together, once they have paired. Males regurgitate food for females before eggs are laid. Any late arrivals pair only after early-nesting pairs have already begun breeding. Pair bonds are maintained for the life of both partners. If a male fails to provide enough food to the female during egg formation or if the partners fail to synchronize their eggs (leaving eggs unattended and often lost or eaten), the pair may separate. Within the colony, pairs nest as far apart as space allows. ("Hinterland Who's Who", 2008; Pierotti and Good, 1994)
There are no displays specific to courtship, but females usually approach males in a hunched posture, producing a begging call. The male responds by assuming an upright posture or mew-calling (see Pierotti & Good for more information on specific types of calls). Head-tossing occurs repeatedly by both male and female and the male regurgitates food for the female; if she eats it, copulation often happens immediately. Otherwise, the female may walk away and prevent copulation. Males jump on females' backs with wings outspread in order to copulate. Mate-guarding is most intense in the week prior to egg laying. Males whose mates have already laid eggs may attempt to force copulation on neighboring incubating females; no such attempt has ever been observed as successful. ("Hinterland Who's Who", 2008; Pierotti and Good, 1994)
Herring gulls breed during spring, pairing around mid-March and laying eggs by mid-May. Adults breed beginning around four years of age, although breeding for the first time at three or five years of age is also observed. Females take 4 to 6 days to lay 3-egg clutches, and the eggs are incubated by both parents for about four weeks. Chicks are able to leave the nest on foot after just one day. Chicks fledge after about six weeks and are fed in the territory where they were born for until about 12 to 15 weeks old. Occasionally, they are cared for by parents off territory for as long as 6 months. ("Hinterland Who's Who", 2008; Pierotti and Good, 1994)
Both male and female parents incubate eggs. The female spends more time incubating than the male does, and incubates at night. The male spends more time away from the nest, procuring food for the female. Many parents remove broken shells once chicks have hatched. Chicks are semiprecocial at hatching, with gray and black down and open eyes. After one week they are able to run around on their own. Chicks are protected by both parents and, during dangerous weather, are brooded until 10 days of age. Chicks fledge at about 6 weeks of age and are fed by parents on parental territory until they are 11 to 12 weeks old; so long as chicks continue to beg, they may receive food from parents until about 6 months of age. Males feed more often before fledging, females feed chicks more after fledging. Studies have found that herring gull parents can feed lead-poisoned chicks, which are generally lighter than normal chicks when studied in the laboratory, enough so that the chicks maintain a close-to-average weight (Burger and Gochfeld, 2000). Chicks are fed regurgitated food that consists of small prey such as small fishes, insects, and earthworms. (Burger and Gochfeld, 2000; "Hinterland Who's Who", 2008; Goryaeva, 2007; Pierotti and Good, 1994)
Herring gulls live up to 30 years of age, but many die earlier, especially as chicks. Causes of mortality include injuries, being shot or poisoned by fishermen, ingesting contaminants such as bacteria and lead (especially in the Great Lakes, where many chicks have shown deformities related to toxins), fishing lines and nets, and occasional predation by predators such as owls and foxes. The dangers presented to ("Hinterland Who's Who", 2008; Pierotti and Good, 1994; "", 2007; Weseloh, et al., 2006)in the Great Lakes by contaminants have decreased since the 1980s, when contaminant levels began to decline. Most deaths occur during breeding, when both adults and young are vulnerable.
Herring gulls are not a solitary species, preferring to nest in colonies. However, they do carefully protect their chosen territory within a colony. Social hierarchies among herring gulls vary; adults are usually dominant over juvenile gulls and, while females prevail regarding choice of nest site, males may dominate females regarding feeding and boundary conflicts. Herring gull pairs return to their same nesting site for so long as the male is alive and has not deserted the female. Herring gull chicks and juveniles “play” by carrying around objects and engaging in tug-of-war games. Herring gulls often develop individual preferences for food and feeding techniques. ("Hinterland Who's Who", 2008; Pierotti and Good, 1994; "Hinterland Who's Who", 2008; Pierotti and Good, 1994)
Herring gulls usually forage within 20 kilometers, but up to 100 kilometers, from their colony; this home range is dependent on location of preferred food sources. (Pierotti and Good, 1994; Pierotti and Good, 1994)
Herring gulls have no song, but have a complex system of anywhere from 8 to perhaps 15 calls; two are used by nestlings and another three are used only by breeding adults. Various calls serve to identify returning partners, demonstrate aggression, warn the colony of predators, and to dispute territory with neighboring gulls. When males are disputing territory, they may pull at grass with their beaks as part of their demonstration. Chicks begin making begging calls to demand food upon hatching; the call grows more intense as they grow and by 5 weeks of age, a chick begs by lifting its head with each peep and holding its head hunched against its body. When chicks are pursued, they emit a shrill waver. The begging call and shrill waver exhibited by chicks are both similar to noises that adult gulls make. Chicks also peck at the red spot on their parent's bills in order to stimulate food regurgitation. ("All About Birds", 2003; Pierotti and Good, 1994)
Herring gulls are opportunistic predators of marine invertebrates, fishes, insects, other seabirds, other birds, bird eggs, and are opportunistic scavengers of dead animals and garbage. Herring gulls are omnivorous but prefer animal foods. Herring gulls at sea forage in scattered groups that converge quickly once prey has been located; the birds follow foraging whales or even fishing boat nets, eating fish, squid, and zooplankton at the surface. Individual specialization in feeding is common, i.e., a particular bird will seek out the same type of food again and again. The type of food consumed differs by the given bird's location and the time of year. For example, in Newfoundland, herring gulls often eat mussels (Mytilus edulis) and refuse during incubation, switch to capelin (Mallotus villosus) when chicks hatch, and then switch to squid (Illex illecebrosus) later in the summer. Herring gulls appear to choose foods according to their dietary needs (such as during egg-laying) when sufficiently numerous food sources are available. ("Hinterland Who's Who", 2008; Goryaeva, 2007; Kubetzki and Garthe, 2003; Pierotti and Good, 1994; Rodway and Regehr, 1999; Weseloh, et al., 2006)
The preference of jerring gulls for living on cliff edges and on rocky off-shore islands with available hiding spots for chicks reflects anti-predator behavior. When a predator is first seen, herring gulls give an alarm call. If a predator approaches, herring gulls give a warning call and then take flight. Herring gulls mob flying predators by diving and striking with beaks and feet, and also dive at terrestrial predators, striking then with wings and feet, rather than with beaks. If a chick gives a shrill waver, its parents attack the involved predator while other herring gulls make intense calls described as "long-call notes." (Pierotti and Good, 1994; Rodway and Regehr, 1999)
Though Somateria mollissima) and puffins (Fratercula artica) which live nearby. Herring gull consumption of dead animals on land and at sea is a form of biodegradation. (Goryaeva, 2007; Pierotti and Good, 1994)is a predator of other birds, its attacks on predators sometimes serve to protect birds such as eiders (
Herring gulls are significant enough in population size to permit their use as experimental subjects both within the wild and the laboratory, with potentially positive results for humans gleaned from the research. In addition, the wide geographic range of herring gulls makes the species useful for making observations concerning pollutants for a great number of areas. For example, herring gulls in the wild have been used to study the behavioral effects of lead, and herring gull eggs from large parts of North America have been used to analyze levels and spread of a number of chemical contaminants. (Burger and Gochfeld, 2000; "Hinterland Who's Who", 2008; Goryaeva, 2007; Weseloh, et al., 2006)
Herring gulls can contribute to beach sanitation by eating dead fish and trash left behind by humans. The gulls, in the pursuit of food, also sometimes lead fishermen to schools of herring. A study in Murmansk, Russia, found that because the diet of urban herring gulls consisted of about 45% rat and town animal remains, herring gulls may contribute to urban sanitation. (Goryaeva, 2007; Weseloh, et al., 2006)
During the late 19th century, along the Atlantic coast, herring gulls were a useful source of eggs and were also pursued for the decorative value of their feathers. (Burger and Gochfeld, 2000; "Hinterland Who's Who", 2008; Goryaeva, 2007; Weseloh, et al., 2006)
Herring gulls have an adverse effect on humans in areas where their population size, combined with their foraging habits (e.g., stealing human food), makes them a pest.
Gulls, including Larus argentatus, are involved in approximately 20.3% of collisions between aircraft and birds. Collisions between aircraft and birds have caused 159,504 hours of aircraft downtime in a 13-year period in the United States and result in economic losses of hundreds of millions of dollars annually. (Blackwell and Bernhardt, 2004; "Hinterland Who's Who", 2008; Blackwell and Bernhardt, 2004; "Hinterland Who's Who", 2008)
Herring gull populations seem to be stable and are not recognized as at risk by conservation agencies.
Herring gulls prefer to drink fresh water, but in the absence of fresh water will drink sea water. These birds have glands located over their eyes which excrete salt; this excretion can be seen dripping off herring gull bills.
Herring gulls are part of a complex of gulls in the Northern Hemisphere, with species and subspecies classifications changing over time. Thayer’s gulls (Larus thayeri) were at one time considered a subspecies of Larus argentatus or Iceland gulls (Larus glaucoides). The only currently recognized subspecies that breeds in North America is L. a. smithsonianus, while nine subspecies are recognized in Eurasia. In addition to subspecies, hybrids are known to occur with great black-backed gulls (Larus marinus) in Canada and with glaucous-winged gulls (Larus glaucescens) in Alaska and Utah. ("All About Birds", 2003; Pierotti and Good, 1994)
Tanya Dewey (editor), Animal Diversity Web.
Shane Spencer (author), University of Maryland, Baltimore County, Kevin Omland (editor, instructor), University of Maryland, Baltimore County.
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.
uses sound to communicate
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
helps break down and decompose dead plants and/or animals
an animal that mainly eats meat
flesh of dead animals.
uses smells or other chemicals to communicate
the nearshore aquatic habitats near a coast, or shoreline.
used loosely to describe any group of organisms living together or in close proximity to each other - for example nesting shorebirds that live in large colonies. More specifically refers to a group of organisms in which members act as specialized subunits (a continuous, modular society) - as in clonal organisms.
to jointly display, usually with sounds in a highly coordinated fashion, at the same time as one other individual of the same species, often a mate
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
A substance that provides both nutrients and energy to a living thing.
a distribution that more or less circles the Arctic, so occurring in both the Nearctic and Palearctic biogeographic regions.
Found in northern North America and northern Europe or Asia.
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
makes seasonal movements between breeding and wintering grounds
eats mollusks, members of Phylum Mollusca
Having one mate at a time.
having the capacity to move from one place to another.
specialized for swimming
the area in which the animal is naturally found, the region in which it is endemic.
an animal that mainly eats all kinds of things, including plants and animals
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
an animal that mainly eats fish
having more than one female as a mate at one time
mainly lives in oceans, seas, or other bodies of salt water.
breeding is confined to a particular season
reproduction that includes combining the genetic contribution of two individuals, a male and a female
associates with others of its species; forms social groups.
uses touch to communicate
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
Living on the ground.
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
living in cities and large towns, landscapes dominated by human structures and activity.
uses sight to communicate
animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)
Scottish Seabird Centre. 2007. Herring gull. Accessed April 13, 2008 at http://www.seabird.org/birds-herring-gull.asp.
Cornell Lab of Ornithology. 2003. "All About Birds" (On-line). Herring Gull. Accessed April 05, 2008 at http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Herring_Gull_dtl.html.
Canadian Wildlife Service & Canadian Wildlife Federation. 2008. "Hinterland Who's Who" (On-line). Herring Gull. Accessed April 05, 2008 at http://www.hww.ca/hww2.asp?cid=7&id=49.
Blackwell, B., G. Bernhardt. 2004. Efficacy of aircraft landing lights in stimulating avoidance behavior in birds. Journal of Wildlife Management, 68/3: 725-732.
Burger, J., M. Gochfeld. 2000. Effects of lead on birds (Laridae): a review of laboratory and field studies. Journal Of Toxicology And Environmental Health, 3/2: 59-78.
Finney, S., M. Harris, L. Keller, D. Elston, P. Monaghan, S. Wanless. 2003. Reducing the density of breeding gulls influences the pattern of recruitment of immature Atlantic puffins Fratercula arctica to a breeding colony. The Journal of Applied Ecology, 40/3: 545-552.
Goryaeva, A. 2007. Reproduction success of the herring gull Larus argentatus in Murmansk in 2006. Doklady Biological Sciences, 416: 389-390.
Kubetzki, U., S. Garthe. 2003. Distribution, diet and habitat selection by four sympatrically breeding gull species in the south-eastern North Sea. Marine Biology, 143/1: 199-207.
Pierotti, R., T. Good. 1994. "Herring Gull (Larus argentatus)" (On-line). The Birds of North America Online. Accessed April 09, 2008 at http://bna.birds.cornell.edu/bna/species/124/articles/introduction.
Rodway, M., H. Regehr. 1999. Habitat selection and reproductive performance of food-stressed herring gulls. The Condor, 101/03: 566-576.
Weseloh, D., C. Pekarik, S. De Solla. 2006. Spatial patterns and rankings of contaminant concentrations in herring gull eggs from 15 sites in the Great Lakes and connecting channels, 1998–2002. Environmental Monitoring and Assessment, 113: 265-284.