Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 5 · SEPTEMBER 8, 2026

Size It Up Dinosaurs answer: September 8

The five Dinosaurs silhouettes for September 8, 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 5 ran from a compsognathus (70 cm) to a diplodocus (26 m). The widest gap was round 3, Compsognathus against Deinonychus, at 4.9×; the closest call was round 2, Dilophosaurus against Ceratosaurus, only 1.0× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Protoceratops Protoceratops andrewsi vs Psittacosaurus Psittacosaurus mongoliensis

    Psittacosaurus · reference · 2 m
    Protoceratops · true length · 1.8 m

    1.1× shorter than the psittacosaurus

    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.

  2. ROUND 2

    Dilophosaurus Dilophosaurus wetherilli vs Ceratosaurus Ceratosaurus nasicornis

    Ceratosaurus · reference · 7 m
    Dilophosaurus · true length · 7 m

    1.0× longer than the ceratosaurus

    Dilophosaurus is represented here by a selected estimated total length of 7 m. Dinosaur reconstructions vary; this is the source value used for this comparison.

  3. ROUND 3

    Compsognathus Compsognathus longipes vs Deinonychus Deinonychus antirrhopus

    Deinonychus · reference · 3.4 m
    Compsognathus · true length · 70 cm

    4.9× shorter than the deinonychus

    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.

  4. ROUND 4

    Triceratops Triceratops horridus vs Diplodocus Diplodocus carnegii

    Diplodocus · reference · 26 m
    Triceratops · true length · 9 m

    2.9× shorter than the diplodocus

    Triceratops is represented here by a selected estimated total length of 9 m. Dinosaur reconstructions vary; this is the source value used for this comparison.

  5. ROUND 5

    Pachycephalosaurus Pachycephalosaurus wyomingensis vs Ankylosaurus Ankylosaurus magniventris

    Ankylosaurus · reference · 8 m
    Pachycephalosaurus · true length · 3 m

    2.7× shorter than the ankylosaurus

    Pachycephalosaurus is represented here by a selected estimated total length of 3 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.

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