Biles put the GPS tags on 10 birds during the Winter season of 2019–2020. When eight returned the subsequent yr, she was elated. Then dismayed. Although 7 of the Teflon backpacks had withstood the kestrels’ razor-sharp beaks, Biles promptly realized she couldn’t get them off—since she couldn’t recapture the birds.However the Kestrel’s m