ALL ANSWERS · DINOSAURS · DAILY No. 58 · OCTOBER 31, 2026
Size It Up Dinosaurs answer: October 31
The five Dinosaurs silhouettes for October 31, 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 58 ran from an avimimus (1.5 m) to a triceratops (9 m). The widest gap was round 1, Avimimus against Centrosaurus, at 4.0×; the closest call was round 2, Ouranosaurus against Styracosaurus, only 1.3× 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
Avimimus Avimimus portentosus vs Centrosaurus Centrosaurus apertus
Centrosaurus · reference · 6 m Avimimus · true length · 1.5 m 4.0× shorter than the centrosaurus
Avimimus is represented here by a selected estimated total length of 1.5 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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ROUND 2
Ouranosaurus Ouranosaurus nigeriensis vs Styracosaurus Styracosaurus albertensis
Styracosaurus · reference · 5.5 m Ouranosaurus · true length · 7 m 1.3× longer than the styracosaurus
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.
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ROUND 3
Alvarezsaurus Alvarezsaurus calvoi vs Riojasaurus Riojasaurus incertus
Riojasaurus · reference · 5.2 m Alvarezsaurus · true length · 2 m 2.6× shorter than the riojasaurus
Alvarezsaurus is represented here by a selected estimated total length of 2 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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ROUND 4
Hypsilophodon Hypsilophodon foxii vs Einiosaurus Einiosaurus procurvicornis
Einiosaurus · reference · 6 m Hypsilophodon · true length · 2 m 3.0× shorter than the einiosaurus
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 5
Megalosaurus Megalosaurus bucklandii vs Triceratops Triceratops horridus
Triceratops · reference · 9 m Megalosaurus · true length · 6 m 1.5× shorter than the triceratops
Megalosaurus is represented here by a selected estimated total length of 6 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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.