Adult © Claudia Brasileiro eBird S40019302 Macaulay Library ML 73418681
Adult © Pio Marshall
Adult and juvenile © Pablo Gutiérrez Maier
Adult © Claudio Jorge Paccot
Adult © Paul Tavares

mustakaulajoutsen Cygnus melancoryphus

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Identification

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Basically unmistakable and is just what the name says: a swan with a black neck. Fairly common but sometimes local on lakes, slow-moving rivers, wetlands with open water, estuaries, and inshore coastal waters. Often in groups, locally hundreds in winter, and associates readily with Coscoroba Swan. Cygnets are pure white and soon develop a dusky neck; within a month or two after hatching they look like adults.

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