I normally wear 4 bands for ID
The silver one’s engraved with a number
That’s in general, too small to see.
So monitors use the combination of all four
To positively identify me.
And if one band should happen to fall off,
Monitors can use the remaining bands and history.
Note: One of this birds bands has fallen off, but I could determine who he was based on where he historically held his territory (where he hangs out), his mate, and his behavior.
Sources: https://fsjconservation.files.wordpress.com/2019/03/florida-scrub-jay-banding-guidelines_final_2019_02_28.pdf
Photo and text © 2021 Dee Fairbanks Simpson
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