Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 10 · SEPTEMBER 13, 2026

Size It Up Dinosaurs answer: September 13

The five Dinosaurs silhouettes for September 13, 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 10 ran from a kentrosaurus (5 m) to a torvosaurus (10 m). The widest gap was round 2, Gallimimus against Lambeosaurus, at 1.5×; the closest call was round 1, Torvosaurus against Maiasaura, only 1.1× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Torvosaurus Torvosaurus tanneri vs Maiasaura Maiasaura peeblesorum

    Maiasaura · reference · 9 m
    Torvosaurus · true length · 10 m

    1.1× longer than the maiasaura

    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.

  2. ROUND 2

    Gallimimus Gallimimus bullatus vs Lambeosaurus Lambeosaurus lambei

    Lambeosaurus · reference · 9 m
    Gallimimus · true length · 6 m

    1.5× shorter than the lambeosaurus

    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.

  3. ROUND 3

    Parasaurolophus Parasaurolophus walkeri vs Yutyrannus Yutyrannus huali

    Yutyrannus · reference · 7.5 m
    Parasaurolophus · true length · 9 m

    1.2× longer than the yutyrannus

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

  4. ROUND 4

    Lufengosaurus Lufengosaurus vs Kentrosaurus Kentrosaurus aethiopicus

    Kentrosaurus · reference · 5 m
    Lufengosaurus · true length · 6 m

    1.2× longer than the kentrosaurus

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

  5. ROUND 5

    Chasmosaurus Chasmosaurus belli vs Anchiceratops Anchiceratops ornatus

    Anchiceratops · reference · 6 m
    Chasmosaurus · true length · 5 m

    1.2× shorter than the anchiceratops

    Chasmosaurus 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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