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Resident Giant Canada Geese

34% of males and 16% of females loose their neck collars within 6 years of banding.
15% of males and 8% of females loose their leg bands within 6 years of banding.

Migrant Mississippi Flyway Canada Geese

90% of males and 50% of females loose their neck collars within < 4.5 years of banding.

Lesser Snow Geese

95% of males and 50% of females loose their neck collars within <4 years of banding.
It is speculated that the rate is so high due to how far north they nest. The 24 hours of sunlight and increased ultraviolet radiation has a detrimental effect on the plastic.

The loss for males is thought to be higher do to fighting amongst themselves over mates.

Source: Journal of Wildlife Management
 
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