Size It Up

ALL ANSWERS · DINOSAURS · DAILY No. 13 · SEPTEMBER 16, 2026

Size It Up Dinosaurs answer: September 16

The five Dinosaurs silhouettes for September 16, 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 13 ran from an anchisaurus (2 m) to a brachiosaurus (22 m). The widest gap was round 5, Huayangosaurus against Brachiosaurus, at 4.9×; the closest call was round 1, Anchisaurus against Oviraptor, only 1.0× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Anchisaurus Anchisaurus polyzelus vs Oviraptor Oviraptor philoceratops

    Oviraptor · reference · 2 m
    Anchisaurus · true length · 2 m

    1.0× longer than the oviraptor

    Anchisaurus is represented here by a selected estimated total length of 2 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  2. ROUND 2

    Stegosaurus Stegosaurus stenops vs Lambeosaurus Lambeosaurus lambei

    Lambeosaurus · reference · 9 m
    Stegosaurus · true length · 9 m

    1.0× longer than the lambeosaurus

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

  3. ROUND 3

    Giganotosaurus Giganotosaurus carolinii vs Eotyrannus Eotyrannus lengi

    Eotyrannus · reference · 5 m
    Giganotosaurus · true length · 13 m

    2.6× longer than the eotyrannus

    Giganotosaurus is represented here by a selected estimated total length of 13 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  4. ROUND 4

    Leaellynasaura Leaellynasaura amicagraphica vs Chasmosaurus Chasmosaurus belli

    Chasmosaurus · reference · 5 m
    Leaellynasaura · true length · 2 m

    2.5× shorter than the chasmosaurus

    Leaellynasaura is represented here by a selected estimated total length of 2 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.

  5. ROUND 5

    Huayangosaurus Huayangosaurus taibaii vs Brachiosaurus Brachiosaurus altithorax

    Brachiosaurus · reference · 22 m
    Huayangosaurus · true length · 4.5 m

    4.9× shorter than the brachiosaurus

    Huayangosaurus is represented here by a selected estimated total length of 4.5 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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