ALL ANSWERS · DINOSAURS · DAILY No. 31 · OCTOBER 4, 2026
Size It Up Dinosaurs answer: October 4
The five Dinosaurs silhouettes for October 4, 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 31 ran from a hypsilophodon (2 m) to a deinocheirus (10 m). The widest gap was round 3, Stegosaurus against Gallimimus, at 1.5×; the closest call was round 1, Hypsilophodon against Oviraptor, 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
Hypsilophodon Hypsilophodon foxii vs Oviraptor Oviraptor philoceratops
Oviraptor · reference · 2 m Hypsilophodon · true length · 2 m 1.0× longer than the oviraptor
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 2
Europasaurus Europasaurus holgeri vs Yutyrannus Yutyrannus huali
Yutyrannus · reference · 7.5 m Europasaurus · true length · 6.2 m 1.2× shorter than the yutyrannus
Europasaurus is represented here by a selected estimated total length of 6.2 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 3
Stegosaurus Stegosaurus stenops vs Gallimimus Gallimimus bullatus
Gallimimus · reference · 6 m Stegosaurus · true length · 9 m 1.5× longer than the gallimimus
Stegosaurus is represented here by a selected estimated total length of 9 m. Dinosaur reconstructions vary; this is the source value used for this comparison.
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ROUND 4
Albertosaurus Albertosaurus sarcophagus vs Deinocheirus Deinocheirus mirificus
Deinocheirus · reference · 10 m Albertosaurus · true length · 9 m 1.1× shorter than the deinocheirus
Albertosaurus 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
Ouranosaurus Ouranosaurus nigeriensis vs Iguanodon Iguanodon bernissartensis
Iguanodon · reference · 10 m Ouranosaurus · true length · 7 m 1.4× shorter than the iguanodon
Ouranosaurus is represented here by a selected estimated total length of 7 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.