Body length9 m
1.1 millionRed blood cells
106Shuttlecock lengths
3,000Sesame seeds
Nose to tail tip
Photo from Wikimedia Commons
Stegosaurus
The plated dinosaur with a brain the size of a walnut/Dinosaurs & Extinct Animals
Stegosaurus is famous for two things: its double row of bony plates and its spectacularly small brain. At roughly 80 grams, its brain was the size of a walnut in a 5-ton body, giving it one of the lowest brain-to-body ratios of any dinosaur. Its spiked tail (the "thagomizer") was a fearsome defensive weapon, though, so it didn't need to outthink its enemies.
Measurements
Body mass5,000 kg
1 millionUS nickels
34,483Baseballs
500 sextillionRhinovirus particles
About 5 metric tons
Brain mass8 hundredths kg
444 millionthsMale gorillas
800 trillionthsAircraft carriers
1.5 hundredthsUnabridged dictionaries
About 80 g, the size of a walnut
Dorsal plate height6 tenths m
5.7 billionHydrogen atoms
4.1 tenthsDanny DeVitos
Largest plates about 60 cm tall
Tail spike length9 tenths m
9.8 hundredthsRV lengths
5.9 hundredthsGarden hose lengths
The thagomizer spikes, ~90 cm
Standing height4 m
18.2Discus diameters
37.7 billionHydrogen atoms
About 4 m at the tallest plate
Era4.7 quadrillion s
3.9 trillionHalftime shows
2.6 trillionPizza deliveries
315 trillionRenditions of Happy Birthday
Lived about 150 million years ago