ALL ANSWERS · DINOSAURS · DAILY No. 45 · OCTOBER 18, 2026
Size It Up Dinosaurs answer: October 18
The five Dinosaurs silhouettes for October 18, 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 45 ran from an oviraptor (2 m) to a diplodocus (26 m). The widest gap was round 5, Pachycephalosaurus against Diplodocus, at 8.7×; the closest call was round 1, Spinosaurus against Corythosaurus, only 1.4× 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.
-
ROUND 1
Spinosaurus Spinosaurus aegyptiacus vs Corythosaurus Corythosaurus casuarius
Corythosaurus · reference · 10 m Spinosaurus · true length · 14 m 1.4× longer than the corythosaurus
Spinosaurus is represented here by a selected estimated total length of 14 m. Dinosaur reconstructions vary; this is the source value used for this comparison.
-
ROUND 2
Australovenator Australovenator wintonensis vs Yangchuanosaurus Yangchuanosaurus shangyouensis
Yangchuanosaurus · reference · 10 m Australovenator · true length · 5 m 2.0× shorter than the yangchuanosaurus
Australovenator is represented here by a selected estimated total length of 5 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
-
ROUND 3
Gallimimus Gallimimus bullatus vs Tyrannosaurus rex Tyrannosaurus rex
Tyrannosaurus rex · reference · 12 m Gallimimus · true length · 6 m 2.0× shorter than the tyrannosaurus rex
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.
-
ROUND 4
Anchiceratops Anchiceratops ornatus vs Oviraptor Oviraptor philoceratops
Oviraptor · reference · 2 m Anchiceratops · true length · 6 m 3.0× longer than the oviraptor
Anchiceratops is represented here by a selected estimated total length of 6 m. Dinosaur reconstructions vary; this is the published estimate used for this comparison.
-
ROUND 5
Pachycephalosaurus Pachycephalosaurus wyomingensis vs Diplodocus Diplodocus carnegii
Diplodocus · reference · 26 m Pachycephalosaurus · true length · 3 m 8.7× shorter than the diplodocus
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.