The World of Dinosaurs
Like Duolingo, but for The World of Dinosaurs. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
70 levels across 8 sections, about 140 minutes end to end, roughly 28 days at five minutes a day. It moves through The Dinosaurian Signature, The Theropod Radiation, The Sauropodomorph Titans, The Armored Defenders, The Cerapodan Success, Mesozoic Biology, The Path to Modernity, and Mastering the Record. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android

Key ideas in The World of Dinosaurs
- The acetabulum is a fully open, perforated hip socket
- Sprawling reptiles compress their lungs while moving side-to-side
- This 'open' socket supports an upright, pillar-like leg posture
- Erect gaits decouple locomotion from breathing for higher stamina
- Upright posture allows for more efficient long-distance movement
- This efficiency supported the higher metabolic rates of active dinosaurs
- The anatomical feature that defines the dinosaur lineage
- The metabolic advantage of an erect gait over a sprawling one
- Saurischian hips have a three-pronged structure with a forward pubis
- Ornithischian hips shifted the pubis backward to accommodate large guts
- The antorbital fenestra is a hole between the nostril and eye
- This opening allowed for massive heads without excessive neck strain
- Distinguishing between the two main dinosaur lineages by hip shape
- Pterosaurs are flying archosaurs but lack the dinosaurian hip
- Plesiosaurs and Ichthyosaurs are marine reptiles, not dinosaurs
- The function of specific skull openings in large dinosaurs
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The World of Dinosaurs the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What is anatomically unique about the dinosaur hip socket, known as the acetabulum?
Get it right to open this lesson and 69 more in the app.
Where The World of Dinosaurs takes you
Move beyond the basics of the T-Rex to explore the complex evolution, specialized clades, and surprising biology of the Mesozoic's most successful inhabitants.
- 1
The Dinosaurian Signature
- Defining the Dinosaur
- The Triassic Origins
- 2
The Theropod Radiation
- Basal Theropods and Early Giants
- The Tyrannosaur Evolution
- The Strange and Specialized
- 3
The Sauropodomorph Titans
- From Bipedal to Quadrupedal
- Diplodocids and Macronarians
- 4
The Armored Defenders
- Stegosaurian Variety
- Ankylosaurs and Nodosaurids
- 5
The Cerapodan Success
- Ornithopods and the Duck-Bills
- The Horned Ceratopsians
- The Bone-Headed Pachycephalosaurs
- 6
Mesozoic Biology
- Metabolism and Growth
- The Feathered Revolution
- 7
The Path to Modernity
- The Transition to Birds
- The K-Pg Extinction
- 8
Mastering the Record
- Phylogenetics and Taxonomy
- The History of Discovery
8 sections · 18 units · 70 levels. Built to play, not to enroll.
You pick the voice
The World of Dinosaurs is taught in the The Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The World of Dinosaurs today.
Download Tomo, search The World of Dinosaurs, and play your first lesson in under a minute.