California Gull

California Gull

Kingdom
Phylum
Class
Family
Genus
SPECIES
Larus californicus
Population size
500,000-1 M
Life Span
4-24 yrs
WEIGHT
430-1,045 g
LENGTH
46-55 cm
WINGSPAN
122-137 cm

California gulls are medium-sized North American seabirds. Adults have a small yellow bill with a black ring, yellow legs, brown eyes, and a more rounded head. Their body is mainly white in color with grey back and upper wings. They have black primaries with white tips. Immature birds have a mottled brown and white plumage, pink legs and beak.

Distribution

California gulls breed in western North America from Northwest Territories, Canada south to eastern California and Colorado. They are migratory, most moving to the Pacific coast in winter. It is only then that these birds are regularly found in western California. Their breeding habitat is lakes and marshes. During the winter they are found along the seacoasts, estuaries, bays, mudflats, near rivers, around farms and plowed fields, and even garbage dumps.

California Gull habitat map

Geography

Climate zones

Habits and Lifestyle

California gulls are highly gregarious birds; they often gather in big flocks and nest in colonies. They are active during the day spending most of their time feeding while flying, walking, wading, swimming and even diving for food. These birds also scavenge at garbage dumps, marinas, and docks. They frequently beg for food at public beaches, parks and other locations where people will hand feed them. They may follow plows in fields for insects stirred up by this activity. When resting, gulls often stand on one leg or sit with their eyes closed. Despite their social nature, these birds are territorial and don't tolerate other gulls in their nest areas. They chase away intruders by stretching their necks straight up and opening their bills. California gulls communicate with each other vocally and frequently utter their main repetitive "kee-yah".

Seasonal behavior

Diet and Nutrition

California gulls are carnivores and scavengers. They mainly eat insects, fish, aquatic invertebrates, the eggs of other birds and carrion. They also eat grains, vegetables, and berries and can often be found at garbage dumps feeding on refuse.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
May-July
INCUBATION PERIOD
24 days
INDEPENDENT AGE
40-30 days
BABY NAME
chick
BABY CARRYING
2-3 eggs

California gulls are monogamous forming pair bonds that usually remain together for several years. The breeding season occurs from May to July. California gulls nest in colonies, sometimes with other birds. Birds build their nest is a shallow depression on the ground lined with vegetation and feathers. The female usually lays 2 or 3 eggs and both parents incubate them around 24 days. Chicks are precocial; they are covered in down and able to stand within a few hours after hatching. The young leave the nest after a few days but stay with their parents until they fledge which occurs at 40 to 60 days of age. They usually reach reproductive maturity and are ready to breed when they 4 years old.

Population

Population threats

California gulls are not threatened globally, however, in some areas, they do suffer from droughts such as on the Mono Lake (California), where one of the largest populations breeds yearly. These birds are also killed occasionally by six-pack drink carriers which get caught around their necks when they feed around garbage dumps.

Population number

According to the What Bird resource, the total number of the California gull is about 620,000 individuals. According to the All About Birds resource, the total breeding population of the species in North America is over 410,000 breeding birds. According to the University of Michigan (Museum of Zoology) resource, the total population size of the California gulls is 500,000 and 1 million birds. Overall, currently, this species is classified as Least Concern (LC), but its numbers today are decreasing.

Fun Facts for Kids

  • Contrary to its name, the California gull is the state bird of Utah.
  • California gull chicks enjoy playing with sticks; they pick up sticks, dropping them, and then picking them up again.
  • California gulls favor cherries. They often beat the cherries off the trees and then eat fallen berries from the ground.
  • California gulls possess an interesting adaptation. The second claw located midway up of their legs helps birds to maintain their balance; that's why gulls are not being blown away by strong winds when they sit on elevated surfaces.
  • In order to make earthworms come to the surface, gull flocks trick their prey by stamping their feet trying to imitate rainfall.

References

1. California Gull on Wikipedia - https://en.wikipedia.org/wiki/California_gull
2. California Gull on The IUCN Red List site - https://www.iucnredlist.org/species/22694321/132542511

More Fascinating Animals to Learn About