Marcela Castellino works as a conservation specialist for Manomet’s Flyways team, visiting wetlands, salt lagoons, and salt flats around Mar Chiquita in Argentina, one of South America’s biggest salty wetlands. She surveys shorebirds to track their populations and strengthen their conservation. One species she studies, Wilson’s Phalarope, travels from their breeding grounds in North America to winter in huge numbers at Mar Chiquita. As they feed, they swim in circles, swirling the water and stirring up things to eat.More info and transcript at BirdNote.org. Want more BirdNote? Subscribe to our weekly newsletter. Sign up for BirdNote+ to get ad-free listening and other perks. BirdNote is a nonprofit. Your tax-deductible gift makes these shows possible.