Red knots are common at and near Prime Hook National Wildlife Refuge in Delaware.

Synchronous Survival: Red Knots and Horseshoe Crabs

Every year toward the beginning of May, in one of the great confluences of nature, red knots migrating from the southern tip of South America descend upon Delaware Bay in …

Clockwise: humpback whales, monarch butterfly, pronghorn antelope

Heading South

Every autumn and winter, in a dramatic act of coordination and navigation, dozens of species across North America migrate vast distances for food, warmth or breeding. Monarch butterflies descend upon …

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