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.
Interesting information, now it makes perfect sense as to why a canadian official called me to see if the neck collar was on the bird, any cracks, and if the bird looked healthy. I thought it was kind of strange to get a home phone call about a neck collar.
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