Calidris alba
Silhouette: Caleb M. Gordon · PhyloPic
In 3 days ~10%
The sanderling (Calidris alba) is a small wading bird. It is a circumpolar Arctic breeder, being among the most extreme northern breeding birds in the world, nesting only on the coldest tundra, north of the 5°C July isotherm; in Europe, its southernmost breeding locality is Svalbard, where only a handful (5–15) pairs breed. It is a long-distance migrant, wintering south to South America, western and southern Europe, Africa, and Australia. It is highly gregarious in winter, sometimes forming large flocks on coastal mudflats or sandy beaches.
It is somewhat unlike other small sandpipers in appearance, in particular in lacking a hind toe, which has led to the suggestion that it should be placed into a monotypic genus Crocethia. More recent reviews indicate that the sanderling is a fairly typical "stint" or small sandpiper and should be retained along with the knots and other relatives in the genus Calidris.
This bird is similar in size to a dunlin, but stouter, with a thick bill. It shows a strong white wingbar in flight, and runs along the sandy beaches it prefers with a characteristic "bicycling" action of its legs, stopping frequently to pick small food items. It eats small crabs and other small invertebrates. In spring, birds migrating north from South America consume large numbers of horseshoe crab eggs in the Delaware Bay area.
In spring, the birds arrive on their High Arctic breeding grounds (see map) at the end of May or in early June, where they lay 3–4 eggs in a ground scrape from mid June to mid July. On the nesting grounds, these birds mainly eat insects and some plant material.
The sanderling was described by the German naturalist Peter Simon Pallas in 1764 and given the binomial name Trynga alba. The sanderling is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Casablanca | 🇲🇦 Morocco | |
| 2 | Maputo | 🇲🇿 Mozambique | |
| 3 | Havana | 🇨🇺 Cuba | |
| 4 | Porto | 🇵🇹 Portugal | |
| 5 | São Luís | 🇧🇷 Brazil | |
| 6 | Kozhikode | 🇮🇳 India | |
| 7 | Kuwait City | 🇰🇼 Kuwait | |
| 8 | Kollam | 🇮🇳 India | |
| 9 | Miami | 🇺🇸 United States | |
| 10 | Dublin | 🇮🇪 Ireland |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | National Zoological Park | 🇺🇸 United States | |
| 2 | Monterey Bay Aquarium | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Sanderling sighting in Nagoya on a given day, based on 70 verified sightings from GBIF citizen-science data. It is the 84th most-seen of the 165 birds we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
November
In that month about 10% of wildlife watchers report a Sanderling in Nagoya on a given day, against under 5% in December to October, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Sanderling sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
27th of 55
Of the 55 cities where we can rate Sanderling sightings, Nagoya ranks 27th at under 5%. The best odds are in Casablanca (Morocco, about 20%), Maputo (Mozambique, about 20%) and Havana (Cuba, about 20%).
GBIF citizen-science records
It is estimated from how often the Sanderling is recorded against all the birds logged in Nagoya (70 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
