Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 9 · SEPTEMBER 12, 2026

Size It Up Dinosaurs answer: September 12

The five Dinosaurs silhouettes for September 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 9 ran from a protoceratops (1.8 m) to a brontosaurus (22 m). The widest gap was round 3, Spinosaurus against Zuniceratops, at 4.0×; the closest call was round 5, Australovenator against Stegosaurus, only 1.8× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Alioramus Alioramus remotus vs Brontosaurus Brontosaurus excelsus

    Brontosaurus · reference · 22 m
    Alioramus · true length · 6 m

    3.7× shorter than the brontosaurus

    Alioramus is represented here by a selected estimated total length of 6 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  2. ROUND 2

    Protoceratops Protoceratops andrewsi vs Camptosaurus Camptosaurus dispar

    Camptosaurus · reference · 5 m
    Protoceratops · true length · 1.8 m

    2.8× shorter than the camptosaurus

    Protoceratops is represented here by a selected estimated total length of 1.8 m. Dinosaur reconstructions vary; this is the source value used for this comparison.

  3. ROUND 3

    Spinosaurus Spinosaurus aegyptiacus vs Zuniceratops Zuniceratops christopheri

    Zuniceratops · reference · 3.5 m
    Spinosaurus · true length · 14 m

    4.0× longer than the zuniceratops

    Spinosaurus is represented here by a selected estimated total length of 14 m. Dinosaur reconstructions vary; this is the source value used for this comparison.

  4. ROUND 4

    Mamenchisaurus Mamenchisaurus hochuanensis vs Baryonyx Baryonyx walkeri

    Baryonyx · reference · 10 m
    Mamenchisaurus · true length · 22 m

    2.2× longer than the baryonyx

    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.

  5. ROUND 5

    Australovenator Australovenator wintonensis vs Stegosaurus Stegosaurus stenops

    Stegosaurus · reference · 9 m
    Australovenator · true length · 5 m

    1.8× shorter than the stegosaurus

    Australovenator is represented here by a selected estimated total length of 5 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.

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