ALL ANSWERS · DINOSAURS · DAILY No. 48 · OCTOBER 21, 2026
Size It Up Dinosaurs answer: October 21
The five Dinosaurs silhouettes for October 21, 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 48 ran from an avimimus (1.5 m) to a nigersaurus (15 m). The widest gap was round 3, Gastonia against Avimimus, at 3.1×; the closest call was round 2, Huayangosaurus against Anchiceratops, only 1.3× apart — the kind of round that separates a 90 from a 60.
SPOILER · TODAY’S FIVE
You have not finished today’s puzzle on this device. The answers below are blurred so you can still play first.
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ROUND 1
Eustreptospondylus Eustreptospondylus oxoniensis vs Allosaurus Allosaurus fragilis
Allosaurus · reference · 9.7 m Eustreptospondylus · true length · 7 m 1.4× shorter than the allosaurus
Eustreptospondylus is represented here by a selected estimated total length of 7 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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ROUND 2
Huayangosaurus Huayangosaurus taibaii vs Anchiceratops Anchiceratops ornatus
Anchiceratops · reference · 6 m Huayangosaurus · true length · 4.5 m 1.3× shorter than the anchiceratops
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.
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ROUND 3
Gastonia Gastonia burgei vs Avimimus Avimimus portentosus
Avimimus · reference · 1.5 m Gastonia · true length · 4.6 m 3.1× longer than the avimimus
Gastonia is represented here by a selected estimated total length of 4.6 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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ROUND 4
Erlikosaurus Erlikosaurus andrewsi vs Riojasaurus Riojasaurus incertus
Riojasaurus · reference · 5.2 m Erlikosaurus · true length · 3.4 m 1.5× shorter than the riojasaurus
Erlikosaurus is represented here by a selected estimated total length of 3.4 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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ROUND 5
Nigersaurus Nigersaurus taqueti vs Triceratops Triceratops horridus
Triceratops · reference · 9 m Nigersaurus · true length · 15 m 1.7× longer than the triceratops
Nigersaurus is represented here by a selected estimated total length of 15 m. This is the museum directory estimate used for this comparison; individual animals and reconstructions vary.
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.