Some of these small parasites have been mutating and are now resistant to many over-the-counter medications.
Listen to the Story
We revisit host Robin Young’s trip with her now-late uncle, Lachlan Maclachlan Field, to see the migrating snow geese at the Dead Creek Refuge in Addison, Vermont. Less than a decade ago, visitors were awed by fields and skies filled with as many as 20,000 geese at a time. But now, because of changing migration patterns, the geese in the area number just a few thousand.