Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 7 · SEPTEMBER 10, 2026

Size It Up Dinosaurs answer: September 10

The five Dinosaurs silhouettes for September 10, 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 7 ran from a compsognathus (70 cm) to a tyrannosaurus rex (12 m). The widest gap was round 4, Gallimimus against Hypsilophodon, at 3.0×; the closest call was round 2, Corythosaurus against Baryonyx, only 1.0× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Compsognathus Compsognathus longipes vs Anchisaurus Anchisaurus polyzelus

    Anchisaurus · reference · 2 m
    Compsognathus · true length · 70 cm

    2.9× shorter than the anchisaurus

    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.

  2. ROUND 2

    Corythosaurus Corythosaurus casuarius vs Baryonyx Baryonyx walkeri

    Baryonyx · reference · 10 m
    Corythosaurus · true length · 10 m

    1.0× longer than the baryonyx

    Corythosaurus is represented here by a selected estimated total length of 10 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  3. ROUND 3

    Australovenator Australovenator wintonensis vs Tyrannosaurus rex Tyrannosaurus rex

    Tyrannosaurus rex · reference · 12 m
    Australovenator · true length · 5 m

    2.4× shorter than the tyrannosaurus rex

    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.

  4. ROUND 4

    Gallimimus Gallimimus bullatus vs Hypsilophodon Hypsilophodon foxii

    Hypsilophodon · reference · 2 m
    Gallimimus · true length · 6 m

    3.0× longer than the hypsilophodon

    Gallimimus is represented here by a selected estimated total length of 6 m. Dinosaur reconstructions vary; this is the source value used for this comparison.

  5. ROUND 5

    Anchiceratops Anchiceratops ornatus vs Psittacosaurus Psittacosaurus mongoliensis

    Psittacosaurus · reference · 2 m
    Anchiceratops · true length · 6 m

    3.0× longer than the psittacosaurus

    Anchiceratops is represented here by a selected estimated total length of 6 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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