5-mil­lime­ter bird band

Popular Science - - TALES FROM THE FIELD -

MATT WILKINS, POST­DOC­TORAL FEL­LOW AT THE CEN­TER FOR SCI­ENCE OUT­REACH AT VAN­DER­BILT UNIVER­SITY

The U.S. Ge­o­log­i­cal Sur­vey dis­trib­utes these half-gram metal bands to help us track birds as they mi­grate south for the win­ter. Some of the fliers weigh just a few tens of grams them­selves.

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