ALL ANSWERS · DINOSAURS · DAILY No. 39 · OCTOBER 12, 2026
Size It Up Dinosaurs answer: October 12
The five Dinosaurs silhouettes for October 12, 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 39 ran from a compsognathus (70 cm) to a mamenchisaurus (22 m). The widest gap was round 5, Compsognathus against Zuniceratops, at 5.0×; the closest call was round 3, Camptosaurus against Alioramus, only 1.2× 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
Stegosaurus Stegosaurus stenops vs Mamenchisaurus Mamenchisaurus hochuanensis
Mamenchisaurus · reference · 22 m Stegosaurus · true length · 9 m 2.4× shorter than the mamenchisaurus
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 2
Deinocheirus Deinocheirus mirificus vs Polacanthus Polacanthus foxii
Polacanthus · reference · 5 m Deinocheirus · true length · 10 m 2.0× longer than the polacanthus
Deinocheirus 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 3
Camptosaurus Camptosaurus dispar vs Alioramus Alioramus remotus
Alioramus · reference · 6 m Camptosaurus · true length · 5 m 1.2× shorter than the alioramus
Camptosaurus is represented here by a selected estimated total length of 5 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
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ROUND 4
Brontosaurus Brontosaurus excelsus vs Styracosaurus Styracosaurus albertensis
Styracosaurus · reference · 5.5 m Brontosaurus · true length · 22 m 4.0× longer than the styracosaurus
Brontosaurus is represented here by a selected estimated total length of 22 m. Dinosaur reconstructions vary; this is the source value used for this comparison.
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ROUND 5
Compsognathus Compsognathus longipes vs Zuniceratops Zuniceratops christopheri
Zuniceratops · reference · 3.5 m Compsognathus · true length · 70 cm 5.0× shorter than the zuniceratops
Compsognathus is represented here by a selected estimated total length of 0.7 m. Dinosaur reconstructions vary; this is the source value 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.