Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 14 · SEPTEMBER 17, 2026

Size It Up Dinosaurs answer: September 17

The five Dinosaurs silhouettes for September 17, 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 14 ran from a hypsilophodon (2 m) to an acrocanthosaurus (12 m). The widest gap was round 5, Concavenator against Hypsilophodon, at 3.0×; the closest call was round 3, Plateosaurus against Maiasaura, only 1.3× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Gallimimus Gallimimus bullatus vs Acrocanthosaurus Acrocanthosaurus atokensis

    Acrocanthosaurus · reference · 12 m
    Gallimimus · true length · 6 m

    2.0× shorter than the acrocanthosaurus

    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.

  2. ROUND 2

    Dilophosaurus Dilophosaurus wetherilli vs Polacanthus Polacanthus foxii

    Polacanthus · reference · 5 m
    Dilophosaurus · true length · 7 m

    1.4× longer than the polacanthus

    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

    Plateosaurus Plateosaurus vs Maiasaura Maiasaura peeblesorum

    Maiasaura · reference · 9 m
    Plateosaurus · true length · 7 m

    1.3× shorter than the maiasaura

    Plateosaurus is represented here by a selected estimated total length of 7 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  4. ROUND 4

    Styracosaurus Styracosaurus albertensis vs Yangchuanosaurus Yangchuanosaurus shangyouensis

    Yangchuanosaurus · reference · 10 m
    Styracosaurus · true length · 5.5 m

    1.8× shorter than the yangchuanosaurus

    Styracosaurus is represented here by a selected estimated total length of 5.5 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  5. ROUND 5

    Concavenator Concavenator corcovatus vs Hypsilophodon Hypsilophodon foxii

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

    3.0× longer than the hypsilophodon

    Concavenator 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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