ALL ANSWERS · DINOSAURS · DAILY No. 42 · OCTOBER 15, 2026
Size It Up Dinosaurs answer: October 15
The five Dinosaurs silhouettes for October 15, 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 42 ran from a protoceratops (1.8 m) to a mamenchisaurus (22 m). The widest gap was round 5, Mamenchisaurus against Zuniceratops, at 6.3×; the closest call was round 1, Torvosaurus against Corythosaurus, 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
Torvosaurus Torvosaurus tanneri vs Corythosaurus Corythosaurus casuarius
Corythosaurus · reference · 10 m Torvosaurus · true length · 10 m 1.0× longer than the corythosaurus
Torvosaurus 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
Albertosaurus Albertosaurus sarcophagus vs Ankylosaurus Ankylosaurus magniventris
Ankylosaurus · reference · 8 m Albertosaurus · true length · 9 m 1.1× longer than the ankylosaurus
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 3
Maiasaura Maiasaura peeblesorum vs Protoceratops Protoceratops andrewsi
Protoceratops · reference · 1.8 m Maiasaura · true length · 9 m 5.0× longer than the protoceratops
Maiasaura 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 4
Stegosaurus Stegosaurus stenops vs Europasaurus Europasaurus holgeri
Europasaurus · reference · 6.2 m Stegosaurus · true length · 9 m 1.5× longer than the europasaurus
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 5
Mamenchisaurus Mamenchisaurus hochuanensis vs Zuniceratops Zuniceratops christopheri
Zuniceratops · reference · 3.5 m Mamenchisaurus · true length · 22 m 6.3× longer than the zuniceratops
Mamenchisaurus is represented here by a selected estimated total length of 22 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.