ALL ANSWERS · DINOSAURS · DAILY No. 21 · SEPTEMBER 24, 2026
Size It Up Dinosaurs answer: September 24
The five Dinosaurs silhouettes for September 24, with the true sizes. If you have not played yet, this page is a spoiler — play these five first, then come back to argue with the numbers.
Day 21 ran from a hypsilophodon (2 m) to a tyrannosaurus rex (12 m). The widest gap was round 1, Corythosaurus against Styracosaurus, at 1.8×; the closest call was round 3, Hypsilophodon against Leaellynasaura, only 1.0× apart — the kind of round that separates a 90 from a 60.
SPOILER · TODAY’S FIVE
You have not finished today’s puzzle on this device. The answers below are blurred so you can still play first.
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ROUND 1
Corythosaurus Corythosaurus casuarius vs Styracosaurus Styracosaurus albertensis
Styracosaurus · reference · 5.5 m Corythosaurus · true length · 10 m 1.8× longer than the styracosaurus
Corythosaurus is represented here by a selected estimated total length of 10 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 2
Tyrannosaurus rex Tyrannosaurus rex vs Iguanodon Iguanodon bernissartensis
Iguanodon · reference · 10 m Tyrannosaurus rex · true length · 12 m 1.2× longer than the iguanodon
Tyrannosaurus rex is represented here by a selected estimated total length of 12 m. Dinosaur reconstructions vary; this is the source value used for this comparison.
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ROUND 3
Hypsilophodon Hypsilophodon foxii vs Leaellynasaura Leaellynasaura amicagraphica
Leaellynasaura · reference · 2 m Hypsilophodon · true length · 2 m 1.0× longer than the leaellynasaura
Hypsilophodon is represented here by a selected estimated total length of 2 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 4
Lambeosaurus Lambeosaurus lambei vs Centrosaurus Centrosaurus apertus
Centrosaurus · reference · 6 m Lambeosaurus · true length · 9 m 1.5× longer than the centrosaurus
Lambeosaurus is represented here by a selected estimated total length of 9 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 5
Abelisaurus Abelisaurus comahuensis vs Allosaurus Allosaurus fragilis
Allosaurus · reference · 9.7 m Abelisaurus · true length · 9 m 1.1× shorter than the allosaurus
Abelisaurus is represented here by a selected estimated total length of 9 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
Beat these tomorrow
Every round is worth up to 100 points: within 6% of the true size scores 100, half or double scores 45, five times off scores zero. The daily puzzle is the same five for everyone and refreshes at midnight in your time zone; if you want more than five, Size It Up Unlimited draws fresh pairs from the whole library for as long as you like.