In heraldry, the duck is usually read as a symbol of resourcefulness, adaptability, and composed self-possession. Because it can move through water, on land, and in the air, it lends itself naturally to the idea of a person who can meet changing conditions with skill and steadiness. Some modern heraldic summaries also connect the duck with prudent caution and practical intelligence, since it survives by alertness as much as by strength. When used in arms, it can therefore suggest versatility, resilience, and a talent for finding safe passage through difficulty rather than charging headlong into danger.

As a heraldic charge, the duck is a recognized but less common bird, which gives it a distinctive character. Traditional reference works note that heraldry may distinguish between the duck proper, drake, sheldrake, wild duck, mallard, teal, and other related forms when these are specifically blazoned. Traceable Heraldic Art: Duck shows that the default posture is typically close, meaning the wings are folded, though heraldic artists also depict ducks rousant, passant, displayed, naiant, or even as a duck’s head erased. DrawShield: Ducks gives useful historical examples, including arms bearing three ducks, drakes, mallards, or sheldrakes, which shows that the charge has long had a place in armory even if it is not among the most common birds.

For heraldic context and images, see Wikimedia Commons: Ducks in heraldry, which gathers many coats of arms and heraldic drawings featuring ducks and related waterfowl. The general background at Wikipedia: Duck also notes examples such as the arms of Lubāna and Föglö. Taken together, these sources show the duck as a heraldic emblem of nimble judgment, adaptability, and quiet competence, especially appropriate for arms connected with waterways, travel, local identity, or families proud of cautious but effective action.