Mallard

How to find it

Realistically, a wild Mallard here would be a surprise, so treat any sighting as something to document. Scan freshwater ponds and marshes, the habitat where it was most likely to occur. Look for the dabbling pose, tail up and head under water. Listen for the female's descending run of quacks. Note the head, bill and speculum colours carefully, because farm ducks and hybrids also exist.

How to recognise it

The male is easy to name. He has a glossy green head split from a chestnut breast by a thin white ring. The body is mostly pale gray, the bill is yellow and the feet are orange.

The female is mottled and scaly in buff-brown and blackish tones, with a black and orange bill. She is a large, sturdy duck, about 61 cm long.

Both sexes show a white-edged wing patch (speculum) that is black or iridescent blue. The male's tends to be blue. These marks describe the species in general, not only birds in Costa Rica.

What it sounds like

Recording: xianning, CC0 1.0, source, read 4 Nov 2026.

Behaviour and diet

In Costa Rica it was seen in pairs and sometimes alone, and it rarely joined mixed flocks. Elsewhere Mallards are social and gather in flocks of varying size.

They feed by dabbling, tipping forward with the tail up and the head under water instead of diving.

Where it lives

In Costa Rica the Mallard was most likely to be found on freshwater ponds and marshes. It was apparently a rare to casual visitor to Guanacaste and the Central Valley, and its Costa Rica entry in the Birds of the World listing places it near Turrialba.

Across its wider range it breeds from Alaska and northern Canada to the southern USA. In winter it moves south to central Mexico and rarely reaches Panama, so a bird here would be a rare stray.

When to see it

The wintering females near Turrialba were recorded from 1950 to 1951.

Similar birds

The Northern Shoveler can look similar. It has a much larger bill, a blue-gray patch on the wing and a greenish speculum.

A Mallard x Muscovy Duck hybrid has also been recorded in Costa Rica. One looked like a Muscovy on the back and crest but had a Mallard-like breast, so an odd duck may not be a pure wild Mallard.

Names and lore in Costa Rica

Costa Ricans call this duck Pato Cabeciverde or Carraco, and the AOCR list gives the full name as Pato Cabeciverde (Carraco). Carraco is a general word for several dabbling ducks: the AOCR list also uses it for the Blue-winged Teal, Cinnamon Teal and Northern Shoveler. A Spanish name list for Costa Rica also gives Ánade Azulón.

Status and conservation

The AOCR list marks the Mallard M-SC, meaning migratory with no official voucher held, and it is a very rare bird here.

Photography tips

The pose to look for is the dabbling one: tail up, head under water, rather than a dive. If you do see a candidate duck, photograph the head, bill, feet and speculum, since the AOCR is asking for evidence for species without a voucher.