📏 Real-size & era comparison lab
🪐 View on the 3D size stage →Stand three animals or dinosaurs next to a 1.75 m person
Line up a person (1.75 m) and three species of your choice at the same scale (1 m = 1 m) to compare length and height, and see how many years apart they lived.
Animal ①
🦖 Tyrannosaurus rex Tyrannosaurus rex
Animal ②
🦕 Brachiosaurus Brachiosaurus altithorax
Animal ③
🐋 Blue Whale Balaenoptera musculus
📐 Same-scale (1 m = 1 m) size stage
- · Grid units represent actual meters (m); human and animals are drawn to the exact same scale with original silhouette aspect ratios preserved.
- · When a size range is recorded (e.g. 1–1.6m), the lower bound is used for scale comparison.
- · Tyrannosaurus rex silhouette: PhyloPic — Matt Dempsey · CC BY 4.0
- · Brachiosaurus silhouette: PhyloPic — Michael P. Taylor · CC0 1.0
- · Blue Whale silhouette: PhyloPic — Scott Hartman · CC BY 3.0
- · Human silhouette: PhyloPic — NASA · Public Domain Mark 1.0
Tyrannosaurus rex
Tyrannosaurus rex
Length 12~12.3m · Height 4m · 7~8.8t
about 67 million years ago (67 Mya)
- 📏 Length 12m — ~1× the length of a 12 m coach bus
- 🏢 Height 4m — ~2.3× the height of a 1.75 m human
Brachiosaurus
Brachiosaurus altithorax
Length 22m · Height 13m · 45~46.9t
about 152 million years ago (152 Mya)
- 📏 Length 22m — ~1.8× the length of a 12 m coach bus
- 🏢 Height 13m — ~4.6 building stories tall (~2.8 m per floor)
Blue Whale
Balaenoptera musculus
Length 29.9~33.5m · Height 4.5m · 170~190t
Extant
- 📏 Length 29.9m — ~2.5× the length of a 12 m coach bus
- 🏢 Height 4.5m — ~2.6× the height of a 1.75 m human
⏳ The three animals you chose lived up to about 152 million years apart. (That gap is longer than the time since the dinosaurs died out, about 66 million years ago.)
⏳ Animals and dinosaurs by geological era
Redlichiaabout 521 million years ago (521 Mya)
Redlichia chinensis
Cambrian (~521 MYA)
Size: No data
Hallucigeniaabout 521 million years ago (521 Mya)
Hallucigenia sparsa
Cambrian (~521 MYA)
Length 0.5~3.5cm
Haikouichthysabout 521 million years ago (521 Mya)
Haikouichthys ercaicunensis
Cambrian (~521 MYA)
Size: No data
Anomalocarisabout 509.7 million years ago (509.7 Mya)
Anomalocaris canadensis
Cambrian (~509.7 MYA)
Length 1m
Opabiniaabout 509.7 million years ago (509.7 Mya)
Opabinia regalis
Cambrian (~509.7 MYA)
Length 4.3~7cm
Elrathiaabout 506.5 million years ago (506.5 Mya)
Elrathia kingi
Cambrian (~506.5 MYA)
Size: No data
Trilobite (Paradoxides)about 505 million years ago (505 Mya)
Paradoxides davidis
Paleozoic, Cambrian to Permian (521–252 million years ago)
Length 45cm · Height 8cm
Eurypterusabout 443.1 million years ago (443.1 Mya)
Eurypterus remipes
Silurian (~443.1 MYA)
Size: No data
Eldredgeopsabout 419.62 million years ago (419.62 Mya)
Eldredgeops rana
Early Devonian – Late Devonian (~419.62 MYA)
Size: No data
Entelognathusabout 419.62 million years ago (419.62 Mya)
Entelognathus primordialis
Early Devonian (~419.62 MYA)
Size: No data
Jaekelopterusabout 410.62 million years ago (410.62 Mya)
Jaekelopterus rhenaniae
Early Devonian (~410.62 MYA)
Length 2.5m
Bothriolepisabout 382.31 million years ago (382.31 Mya)
Bothriolepis canadensis
Late Devonian (~382.31 MYA)
Length 25cm
Tiktaalikabout 382.31 million years ago (382.31 Mya)
Tiktaalik roseae
Late Devonian (~382.31 MYA)
Length 1.2~2.7m
Ichthyostegaabout 372.15 million years ago (372.15 Mya)
Ichthyostega stensioei
Late Devonian (~372.15 MYA)
Size: No data
Acanthostegaabout 372.15 million years ago (372.15 Mya)
Acanthostega gunnari
Late Devonian (~372.15 MYA)
Size: No data
Dunkleosteusabout 365 million years ago (365 Mya)
Dunkleosteus terrelli
Paleozoic, Late Devonian (382–358 million years ago)
Length 4~9m · Height 1.6m
Arthropleuraabout 318.7 million years ago (318.7 Mya)
Arthropleura armata
Late Carboniferous (~318.7 MYA)
Length 2.7m
Meganeuraabout 303.7 million years ago (303.7 Mya)
Meganeura monyi
Late Carboniferous (~303.7 MYA)
Wingspan 70cm
Dimetrodonabout 298.9 million years ago (298.9 Mya)
Dimetrodon limbatus
Early Permian (~298.9 MYA)
Size: No data
Eryopsabout 298.9 million years ago (298.9 Mya)
Eryops megacephalus
Early Permian (~298.9 MYA)
Length 1.8m
Helicoprionabout 293.52 million years ago (293.52 Mya)
Helicoprion bessonowi
Early Permian – Middle Permian (~293.52 MYA)
Size: No data
Diplocaulusabout 290.1 million years ago (290.1 Mya)
Diplocaulus magnicornis
Early Permian (~290.1 MYA)
Size: No data
Edaphosaurusabout 283.3 million years ago (283.3 Mya)
Edaphosaurus pogonias
Early Permian (~283.3 MYA)
Size: No data
Inostranceviaabout 264.28 million years ago (264.28 Mya)
Inostrancevia alexandri
Middle Permian – Late Permian (~264.28 MYA)
Size: No data
Lystrosaurusabout 259.86 million years ago (259.857 Mya)
Lystrosaurus murrayi
Middle Permian – Middle Triassic (~259.857 MYA)
Size: No data
Utatsusaurusabout 250.8 million years ago (250.8 Mya)
Utatsusaurus hataii
Early Triassic – Middle Triassic (~250.8 MYA)
Length 2~3m
Nothosaurusabout 247 million years ago (247 Mya)
Nothosaurus mirabilis
Middle Triassic (~247 MYA)
Length 2.9~3.2m
Placodusabout 247 million years ago (247 Mya)
Placodus gigas
Middle Triassic (~247 MYA)
Length 2m
Keichousaurusabout 239.48 million years ago (239.48 Mya)
Keichousaurus hui
Middle Triassic (~239.48 MYA)
Length 27.4cm
Herrerasaurusabout 237 million years ago (237 Mya)
Herrerasaurus ischigualastensis
Late Triassic (~237 MYA)
Length 3m
Eoraptorabout 233.6 million years ago (233.6 Mya)
Eoraptor lunensis
Late Triassic (~233.6 MYA)
Length 1.7m
Shonisaurusabout 233.6 million years ago (233.6 Mya)
Shonisaurus popularis
Late Triassic (~233.6 MYA)
Length 14.9m
Coelophysisabout 227.3 million years ago (227.3 Mya)
Coelophysis bauri
Late Triassic (~227.3 MYA)
Length 2m
Plateosaurusabout 227.3 million years ago (227.3 Mya)
Plateosaurus trossingensis
Late Triassic (~227.3 MYA)
Length 7m
Postosuchusabout 227.3 million years ago (227.3 Mya)
Postosuchus kirkpatricki
Late Triassic (~227.3 MYA)
Size: No data
Rutiodonabout 227.3 million years ago (227.3 Mya)
Rutiodon carolinensis
Late Triassic (~227.3 MYA)
Size: No data
Ichthyosaurusabout 205.7 million years ago (205.7 Mya)
Ichthyosaurus communis
Late Triassic – Early Jurassic (~205.7 MYA)
Size: No data
Dilophosaurusabout 201.4 million years ago (201.4 Mya)
Dilophosaurus wetherilli
Early Jurassic (~201.4 MYA)
Length 7m
Massospondylusabout 201.4 million years ago (201.4 Mya)
Massospondylus carinatus
Early Jurassic (~201.4 MYA)
Length 4m
Lufengosaurusabout 201.4 million years ago (201.4 Mya)
Lufengosaurus huenei
Early Jurassic (~201.4 MYA)
Length 6m