NIENHUIS J, HULSCHER JB & VOSLAMBER B (2020) A neck band as a distinguishing feature of recognition for a Greater Canada Goose Branta canadensis gosling by its family. LIMOSA 93 (2): 79-81.
A 64-day-old Greater Canada Goose, a young adopted two
days after hatching, lost its neck band on July 26, 2019,
after having worn it for 17 days. Henceforth he was treated
aggressively by his foster parents and his seven siblings, the
other Greater Canada Geese in a moulting flock and a pair
of Egyptian Geese with young. Apparently they no longer
accepted him. The young goose tried to rejoin his foster
parents, initially remaining at a distance of 10-40 meters from
the family group. The hostility declined gradually and on July
31 the gosling had returned into the family group, although
it was still treated with moderate aggression. On that same
day the young goose was caught again and given a new
neck band. He joined his family immediately and remained
close to his foster mother. No aggression whatsoever was
apparent. It seems the neck collar had become a distinctive
cue for recognition of a family group member.
Ringing with a conspicuous neck band may have a major
impact on behaviour towards a gosling. However, we have
never noticed any recognition problems between individuals
in a flock or between family or pair members after our yearly
collective catching and banding sessions.
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