Canvasback

How to find it

A vagrant is best searched for on lakes among other diving ducks. Open water is the place to look, since the species seldom comes ashore. Scan each raft slowly and look for the wedge-shaped head profile, which helps you pick it out of a mixed flock. Check any chestnut-headed duck with a black bill and a whitish back. Costa Rica sees only a few vagrants, so a good candidate deserves careful photos and a guide's opinion.

How to recognise it

The Canvasback is the largest diving duck in North America, 48 to 56 cm long. It is about the size of a mallard but heavier and more compact. These details describe the species across its range, so use them as a checklist for any suspect duck.

Its best field mark is the long, sloping head and bill profile, with the forehead running straight into a black bill. That wedge shape helps you pick it out of a mixed flock.

The male has a chestnut head, a black bill, a black chest and a whitish back.

The female is brownish-gray with a pale tan head.

Behaviour and diet

Canvasbacks live on open water in rafts and seldom come ashore. They dive for much of their food from the lake bottom.

They need a running start across the water to take off. Once airborne they are strong, fast fliers, reaching about 56 miles per hour.

Where it lives

Across its range the Canvasback is a bird of open water. It usually winters on the California and Texas coasts and in northern to central Mexico, and it reaches only central Mexico in small numbers in winter. There have been a few sightings in northern Central America and the Caribbean.

Costa Rica lies well south of that normal winter range, which fits its accidental status here. The official list treats it as a vagrant, not a resident.

Similar birds

Costa Rica's other accidental Aythya ducks are the Redhead and the Common Pochard. The Canvasback is larger than the Redhead and has a long sloping forehead running straight into a black bill. The Redhead has a rounder head, so compare head shape first.

Names and lore in Costa Rica

Porrón Picudo is the Spanish name used in Costa Rica, and Nicaragua uses it too. Other countries differ, such as Pato Coacoxtle in Mexico. Spanish sources also give porrón coacoxtle, pato lomo blanco, pato piquisesgado and porrón de lomo cruzado, but these come from general Spanish sources, not Costa Rican nicknames.

Status and conservation

The Asociación Ornitológica de Costa Rica lists the Canvasback as status A (accidental), and the 2025 to 2026 list, updated June 2026, keeps it that way.

Photography tips

Canvasbacks live on open water in rafts and seldom come ashore, so scan lakes among other diving ducks. The wedge-shaped head profile helps you pick one out of a mixed flock. Photograph the head and bill in profile first.