Bewick's bird is usually confused with other two swan species.Though bewick's bird has an obvious difference from Mute Swan which is that it has a yellow-and-black bill and holds its neck not in an S-shape rather in a straight way. In order to distinguish it from Whooper Swan a closer attention must be paid. The bill of Bewick's bird is black with a yellow patch on the bill sides. On its interior edge; it is rounded; extending less than 50 per cent of the length of the bill. Bill patterns so greatly that each bird can be recognized via their bill pattern alone. Bewick's is smaller, shorter-necked and dumpier in comparison to Whooper. Bewick's one appears more goose-like in shape. Juveniles are greyish in plumage, the bill again variable but mainly pink with black parts increasing with maturity.
Bewick's bird nest in the Arctic tundra, In the breeding season, , in lowland swampy areas with numerous pools and lakes. Outside this season, en route to and from their wintering areas, they will use lakes, rivers and pools, while in their winter quarters they prefer low-elevation lakes, reservoirs, and rivers with nearby flooded grassland and pastures. Bewick's birds have a strong attachment to regular inland wintering sites, although can vary these over time depending on food supply and climatic conditions. In England they have become habituated to being fed grain at Welney and Slimbridge, in atypically close proximity to humans.
Various calls are given; the most familiar to observers in american region are the flight calls, and calls of a flock at rest. In flight a repeated monosyllabic honking is given, difficult to describe but approximating to "waah'h waah'h", "haap haap", "uh-rrh uh-raa". When several birds call simultaneously this merges into a multisyllabic barking "wooh wow waow aaoo how", somewhat like a cinematic version of a 'Red' Indian war party. At rest a flock gives a conversational chuntering of birds calling to their mates and young, making a musical babble of variously pitched sounds such as "oo-oo-ow-ow...".