Why a Muscovy needs ID more than most ducks
A Muscovy duck gets loose by routes other ducks cannot use. Muscovies perch, roost in low trees and fly well for their size, especially the lighter females, so a Muscovy that clears a fence may be found gardens or fields away rather than waddling in the next pen. Once there, the common black-and-white plumage describes half the Muscovies in the district, and a description alone starts arguments where two keepers both have birds missing. Identification this duck carries has to travel over the fence with it, and it needs a photographed backup as individual as the bird itself.
A leg band fitted for a heavy, strong-legged duck
A Muscovy's leg band must suit a bigger, stronger bird than a laying duck. Choose a band sized for the drake's thicker leg or the female's slimmer one as appropriate, smooth and closed or securely fastened so it cannot work loose over the foot, snag on wire or be worried off by the bird itself. Fit bands when birds are mature enough that leg size has settled, then check them at every catch: a band that has tightened on a still-growing drake, cracked, or filled with dried mud so its number cannot be read has stopped being identification. Muscovies use their feet and claws on perches and rough ground more than other ducks, so look for wear and rubbing at the same time as you check the band itself.
The caruncle photograph: a Muscovy's built-in signature
A Muscovy carries one identifier no band can match: its face. The red caruncles, the knobbly bare skin around the bill and eyes, develop a pattern of bumps, ridges and coverage that differs visibly between individuals and becomes more pronounced in drakes. Photograph each bird's head from the front and both sides in good light, close enough that the caruncle pattern reads clearly, and update the set as young birds mature and their faces redden and roughen. Note the plumage pattern in the same record: which side carries the larger white wing patch, whether the head is black, white or mixed, and any crest, because a Muscovy's markings, unlike a uniform khaki breed, genuinely vary and a finder will describe them. A band number plus a matching caruncle photograph is close to unarguable evidence of which keeper a stray belongs to.
Records that tie the band to the bird
Keep a flock list for the Muscovies that pairs every band number or colour with the individual bird's sex, age, plumage description and caruncle photographs, updated when birds are bought, sold or moved between pens. Sex matters in the record because drakes grow to nearly twice the females' size, and a finder reporting a very large duck or a modest one can be matched against the list before photographs are even compared. Note which birds have had a wing clipped if you clip, since a clipped bird found nearby and a full-winged bird found far away point to different escape routes and different individuals. Store the list where another member of the household can find it, because the person at home when a neighbour calls about a strange duck may not be the person who banded it.
Claiming the Muscovy that flew out
When a Muscovy is found, expect the finder to describe the face first, since the red caruncles are what everyone notices, and the band second. Talk them through the leg band, quote its colour and number from your list, then produce the caruncle photographs that match the bird in their garden, and the identification is settled without handling a large, possibly stressed duck more than necessary. Recording your Muscovy's band code and face photographs in KinsLe on a Pet Pass keeps the duck's verified identity and your contact details together on a single card, ready to show the moment a flown bird turns up in someone else's yard.