Popular Science - - CHARTED -

Ducks mi­grate south­ward from breed­ing grounds in Siberia to warmer win­ter spots each year. Be­cause they carry pathogens, un­der­stand­ing their move­ments is crit­i­cal to global health. “The body tem­per­a­ture of ducks in China can help tell us if a bird flu out­break is be­gin­ning,” Wikel­ski says.

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