Grey Plover

About

The Grey Plover, also known as the Black-bellied Plover in North America, is a medium-sized shorebird with a circumpolar breeding distribution in the Arctic tundra. It is known for its striking black breeding plumage and its distinctive 'plee-oo-ee' call. It undertakes long-distance migrations to coastal areas across much of the world.

Size & lifespan

Length

27-31 cm

Wingspan

71-83 cm

Weight

170-320 g

Lifespan

Up to 20 years in the wild

Diet

Carnivore (invertebrates)

Physical characteristics

Plumage

Non-breeding plumage: Upperparts are mottled grey-brown with fine white speckles, underparts are white with streaky grey on the breast and flanks. Breeding plumage: Upperparts are black with white speckles, face and underparts are entirely black, sharply demarcated from the white forehead, supercilium, and flanks. A prominent white band extends from the forehead over the eye and down the sides of the neck and breast.

Beak shape

Short, stout, and straight, black in color.

Eye color

Dark brown.

Leg color

Dark grey to black.

Distinguishing features

In all plumages, the presence of a prominent black 'armpit' (axillary feathers) visible in flight is a key diagnostic feature. It also has a distinctive white wing bar and a white rump contrasting with a dark tail in flight.

Juvenile appearance

Juveniles resemble non-breeding adults but have more yellowish-buff mottling on the upperparts and breast, giving them a scaly appearance. The underparts are whiter, and the black axillaries are present.

Seasonal changes

Undergoes a dramatic plumage change between non-breeding (grey-brown and white) and breeding (black and white) plumages. The transition occurs during spring migration, with full breeding plumage typically attained on the breeding grounds.

Sexual dimorphism

Males and females are generally similar in appearance, though males in breeding plumage tend to have more extensive and intense black on the underparts. Females may be slightly duller.

How to identify

1. 1

   Size and Shape

   Medium-sized, stocky shorebird with a relatively large head and short, stout bill.

2. 2

   Plumage (Breeding)

   Look for the striking black face and underparts, sharply contrasting with white forehead, supercilium, and flanks. Upperparts are black with white speckles.

3. 3

   Plumage (Non-breeding)

   Overall grey-brown upperparts with fine white speckles, white underparts with streaky grey on the breast. Less distinctive but still identifiable.

4. 4

   In-flight Markings

   The most reliable field mark in all plumages is the prominent black 'armpit' (axillary feathers) visible against the white underwing. Also note the white wing bar and white rump contrasting with a dark tail.

5. 5

   Call

   Listen for its distinctive, mournful, three-note whistle 'plee-oo-ee' or 'tlee-oo-ee'.

6. 6

   Behavior

   Observe its characteristic 'run-stop-scan' foraging method on mudflats.

Habitat & range

Biomes

Tundra (breeding), coastal wetlands, estuaries, mudflats, sandy beaches, rocky shores (non-breeding).

Geographic range

Circumpolar Arctic for breeding (northern Canada, Alaska, Siberia). Non-breeding range is extensive, covering coastal areas of all continents except Antarctica, including Europe, Africa, Asia, Australasia, and North and South America.

Elevation range

Primarily low-lying coastal areas during non-breeding season; tundra plains during breeding season.

Preferred environments

During migration and winter, they prefer intertidal zones with soft substrates for foraging, such as mudflats and sandflats. Breeding habitat is typically dry, elevated tundra ridges and hummocks near wetlands.

Behavior

Activity time

Diurnal, but also forages at night during low tide, especially on moonlit nights.

Feeding habits

Forages by sight, running short distances and then stopping abruptly to scan for prey. It uses its short bill to probe shallowly into mud or sand for marine worms, small crustaceans (crabs, shrimp), mollusks, and insects. Occasionally takes small fish.

Social behavior

Highly social outside the breeding season, forming large flocks, sometimes mixed with other shorebird species. During breeding, they are territorial and typically solitary or in loose pairs.

Flight pattern

Strong, direct flight with rapid wingbeats. Often flies in tight flocks during migration. The black axillaries are very conspicuous in flight.

Migration pattern

Long-distance migratory. Breeds in the Arctic and migrates south to temperate and tropical coastal regions for the non-breeding season. Migration routes are broad, often following coastlines.

Territoriality

Highly territorial during the breeding season, defending a nesting area. Less territorial during migration and winter, where feeding grounds are shared.

Breeding & reproduction

Breeding season

Late May to early July in the Arctic tundra.

Nesting habits

Nests are shallow scrapes on dry, elevated tundra ridges or hummocks, often lined with lichens, moss, and leaves. Both parents participate in nest site selection and construction.

Clutch size

Usually 4 eggs.

Egg description

Typically 4 eggs, pear-shaped, pale olive to buff with dark brown or black blotches and spots, concentrated at the larger end.

Incubation period

26-27 days, shared by both parents.

Fledging period

Chicks are precocial and leave the nest shortly after hatching. They fledge in approximately 28-35 days.

Parental care

Both parents incubate eggs and care for the young. Females often depart before the young fledge, leaving the male to complete parental duties.

Where to find

Field tips

1. Tide Watching. Grey Plovers are highly dependent on tidal cycles for feeding. Plan your visit to coastal areas around low tide when mudflats are exposed.
2. Scan Flocks. They often associate with other large shorebirds like godwits and curlews. Carefully scan mixed flocks for their distinctive features.
3. Listen for Calls. Their distinctive whistle is often heard before the bird is seen, especially during migration or in foggy conditions.
4. Observe Flight. If a flock takes flight, look for the diagnostic black axillaries and white wing bar.

Similar species

Quick facts

Global Distribution:

Circumpolar Arctic breeder, widespread coastal non-breeder.

Key ID Feature:

Black 'armpit' (axillary feathers) in flight.

Breeding Plumage:

Black face and underparts, white supercilium, speckled black back.

Non-breeding Plumage:

Grey-brown upperparts, white underparts.

Diet:

Marine invertebrates (worms, crustaceans, mollusks).

Fun facts

• The Grey Plover is one of the most widespread shorebirds globally, undertaking epic migrations from the Arctic to nearly every continent.
• Its North American common name, 'Black-bellied Plover', refers to its striking breeding plumage, which is a key identification feature.
• The black axillary feathers are unique among plovers and are a reliable way to identify the species in any plumage, even at a distance in flight.
• During the non-breeding season, Grey Plovers can be found in large, sometimes mixed-species, flocks, demonstrating their social nature outside of the breeding period.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Charadriiformes

Family

Charadriidae

Genus

Pluvialis

Species

Pluvialis squatarola

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