Ostrigar

Остригар — © Zveriki.com, AI-generated image based on the original work of pjd1 (https://www.inaturalist.org/people/pjd1), Creative Commons Attribution-Share Alike 4.0 International

Using its sharp and strong beak, the Eurasian oystercatcher cracks open mollusk shells and eats their flesh.

Старост

Eurasian oystercatchers have a typical lifespan of from 32 years and 6 months to 54 years and 2 months, with a maximum recorded lifespan of 43 years and 4 months, although the theoretical lifespan is from 8 years to 43 years and 2 months. The species reaches sexual maturity from 2 years and 3 months to 3 years and 9 months. Development begins with the "Embryo" stage, during which the embryo develops inside an egg laid in a small pit on the ground. Following hatching, the young enter the "Chick" stage, covered in grayish down and remaining in or near the nest for from 1 month to 1 month and 1 week. The "Rapid Growth Juvenile" stage follows, lasting from 1 month and 1 week to 2 years, during which the young bird resembles adults but has a darker and shorter beak. Finally, the species enters the "Adult" stage, capable of reproduction, living on the coast, raising offspring, and lasting from 2 to 40 years.

Фенотип

The Eurasian oystercatcher has black plumage on its head, neck, back, and wings, with white feathers on its breast and belly, and a broad white stripe on the wings. The species’ legs are long and strong, colored pink, allowing it to walk on wet sand and shallow water; its beak is short as a chick, but long, strong, and bright red in adults, used to open or break mollusk shells. Bright red eyes help the adult oystercatcher see well in bright light on the seashore. Downy feathers protect young oystercatchers from the cold.

Физиологија

Eurasian oystercatchers measure from 40 to 48 centimeters in body length, with a wingspan ranging from 82 to 87 centimeters, and weigh from 398 to 483 grams. The young birds have a body mass from 30 to 60 grams and a body length from 10 to 15 centimeters. Following rapid growth, the young of the species have a body mass from 300 grams to 0.5 kilograms and a body length from 35 to 42 centimeters. Adult Eurasian oystercatchers weigh from 400 grams to 0.55 kilograms and measure from 40 to 46 centimeters in body length.

Станиште

Eurasian oystercatchers inhabit estuaries and deltas, marine environments, coastal waters, land, and woodland areas; the species’ habitat includes river mouths where fresh water meets the sea, temperate mixed forests with oak, birch, and maple trees, flooded meadows, shallow coastal waters, and taiga forests characterized by coniferous trees such as spruce and pine. The elevation of their habitat ranges up to 100 meters above sea level. They are found in biomes that include river estuaries merging into the sea, temperate mixed forests, flooded meadows, shallow coastal waters, and taiga. The climate they experience includes cool summers with temperatures between 15 and 20 degrees Celsius, consistently high rainfall, moderate seas with cool or warm water, and both cool summers with abundant rain and warm summers with plentiful rain.

Склониште

Eurasian oystercatchers are found on shorelines above the high tide line or on low islands. The species builds or uses a nest, which is a structure for laying eggs and raising young. The nest is constructed from grass, shells, and twigs.

Географија

Eurasian oystercatchers are found within the Palearctic biogeographical region and the marine realm. The species inhabits Keltské broadleaf forests, Caledonian coniferous forests, Baltic mixed forests, European Atlantic mixed forests, Sarmatian mixed forests, and wet mixed forests of the North Atlantic.

Храна

Eurasian oystercatchers primarily feed on bivalve mollusks, locating them during low tide and either inserting their beak between the shells to cut the muscle or striking the shell to break it, employing probing and pecking techniques for food acquisition; the species actively hunts, searching for and obtaining food including mussels, oysters, other mollusks, worms, crustaceans, and a mollusk identified as 234-f:Cid. The diet also includes worms and crustaceans. The daily food requirement ranges from 50 grams to 90 grams.

Размножавање

Eurasian oystercatchers reproduce sexually, and birds form pairs. The female lays eggs in a pit on the ground, and the clutch has 2 to 4 eggs. Both parents take turns incubating the eggs and feeding the young. Embryonic development lasts 3 weeks and 6 days. A clutch has 2 to 4 young, and the species reproduces every 1 year. The male and female both care for the offspring. Individuals reach maturity from 2 to 3 years of age.