Facts about Archelon

1. 08

   Archelon's neck could retract into its shell for protection, a defensive mechanism absent in modern sea turtles that spend their entire lives in open ocean.

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2. 07

   Archelon's front flippers were elongated and wing-like, spanning up to 11 feet across, providing powerful propulsion through Late Cretaceous seaways.

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3. 06

   Archelon's fossils show it had a relatively small brain compared to its massive body size, suggesting limited cognitive abilities despite dominating Late Cretaceous seas.

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4. 05

   In the Western Interior Seaway during the Late Cretaceous, Archelon possessed a lightweight skeleton with reduced bone density compared to modern sea turtles, enabling it to remain neutrally buoyant while hunting at various ocean depths.

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5. 04

   Archelon's jaw was toothless and featured a sharp beak similar to modern sea turtles, enabling it to crush hard-shelled prey like ammonites in Late Cretaceous oceans.

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6. 03

   Archelon's shell was leathery rather than bony like modern sea turtles, allowing greater flexibility for diving in Cretaceous seas 66 million years ago.

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7. 02

   Archelon's flippers lacked claws, unlike modern sea turtles, making it better adapted for open ocean swimming in the Western Interior Seaway.

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8. 01

   Measuring up to 15 feet long, Archelon was the largest sea turtle ever to exist during the Late Cretaceous period.

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