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World 6 · Feathers, Birds and Extinction · 12 min · PRO

The asteroid at the K–Pg boundary

Evidence for an impact 66 million years ago

PRO · Dinosaur Dig

World 6: Feathers, Birds and Extinction is part of PRO

The first world of Dinosaur Dig is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Feathers before flight
  • Archaeopteryx and the dinosaur–bird tree
  • Survivors and what came next
  • Relative dating and index fossils
  • Half-life: the atomic clock
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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