Qualla: Delaware Bay

Delaware Bay: Introduction

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit TonyPalmJr, CC BY 4.0. On a single May night, by the dim light of a high spring tide, the largest population of horseshoe crabs on the planet crawls onto the beaches of Delaware Bay. The crabs are older than the dinosaurs - their body plan unchanged for roughly 450 million years - and they have come to lay eggs in the wet sand. Within hours, exhausted red knots will be feeding on those eggs. The red knots have just flown from Tierra del Fuego, at the very tip of South America, and are halfway through one of the longest migrations of any bird on Earth, with thousands of miles still to go before they reach the Arctic. They will eat horseshoe crab eggs by the millions and then keep flying. Without this particular bay, on this particular week, the entire migration collapses. There is nothing else like Delaware Bay anywhere.

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Image: TonyPalmJr | CC BY 4.0

Delaware Bay: A Drowned River

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit PointsofNoReturn, CC BY-SA 4.0. Delaware Bay is a ria - geological shorthand for a river valley that the rising sea has invaded. During the last ice age, when so much of the planet's water was locked in continental glaciers, sea levels were hundreds of feet lower, and the Delaware River cut a wide alluvial plai...

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Image: PointsofNoReturn | CC BY-SA 4.0

Delaware Bay: The Crab and the Bird

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit Chuck Homler d/b/a Focus On Wildlife, CC BY-SA 4.0. The horseshoe crab is technically a chelicerate - more closely related to spiders than to true crabs. Its bronze blood, copper-based rather than iron-based, has saved more human lives than perhaps any other compound in modern medicine: a clotting agent extracted from horseshoe cr...

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Image: Chuck Homler d/b/a Focus On Wildlife | CC BY-SA 4.0

Delaware Bay: Lenape Waters

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit Zeete, CC BY-SA 4.0. The Lenape people lived along these shores when the first Europeans arrived in the early 1600s. They called the river the Lenape Wihittuck - the rapid stream of the Lenape. The bay itself they called Poutaxat, meaning roughly near the falls, a reference to the head of navigation ...

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Image: Zeete | CC BY-SA 4.0

Delaware Bay: Zwaanendael and the First Settlement

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit Tim Kiser (w:User:Malepheasant), CC BY-SA 2.5. The Dutch tried to settle the bay shore in 1631 at a small outpost called Zwaanendael, near what is now Lewes, Delaware. Thirty-two colonists came over to build a whaling station. Within a year they were all dead - killed in a confrontation with the local Lenape over a dispute th...

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Image: Tim Kiser (w:User:Malepheasant) | CC BY-SA 2.5

Delaware Bay: The Largest Shore-Bird Stopover

Mon, 01 Jun 2026 00:00:00 GMT

Photo credit Smallbones, CC0. In 1986 the bay was designated the inaugural site of the Western Hemisphere Shorebird Reserve Network, and in 1992 it was also designated a Ramsar Wetland of International Importance. More than thirty species of migrating shorebirds use Delaware Bay as a critical refueling stop e...

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Image: Smallbones | CC0