Pendant 18 ans, Glenn Therres a regardé la récupération des pygargues à tête blanche du Maryland depuis la fenêtre d’un avion à quatre places.
Biologiste de longue date du pygargue à tête blanche pour le Département des ressources naturelles du Maryland, Therres avait compté les nids pour l’enquête annuelle sur le pygarque à tête blanche depuis 1985, alors qu’il n’y avait que 62 paires de reproduction dans l’État. Chaque année, il traverserait les parties aqueuses du Maryland à partir de 200 pieds au-dessus dans un Cessna, balayant les cimes à la cime pour les nids de pygargue à tête blanche. Quelques mois plus tard, il reviendrait pour compter les oisillons.
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