Therizinosaurus Size Comparison
Therizinosaurus 3D Viewer pairs published Late Cretaceous figures with a 1.8 m person on screen - length about 9-10 m (Size vs human uses about 9.5 m), height about 4-5 m, and weight about 5-10 tonnes - so the scale gap stays readable at a glance.
Therizinosaurus published figures
The Therizinosaurus facts panel and this table disclose published ranges rather than one invented single number; the Size vs human control uses about 9.5 m as the length scale ratio:
| Measure | Figure | Vs a 1.8 m person |
|---|---|---|
| Length | about 9-10 m; Size vs human uses about 9.5 m | ~5.3x a person end-to-end at the 9.5 m scale figure |
| Height | about 4-5 m | roughly 2-3x a standing person |
| Weight | about 5-10 tonnes depending on method; NHM (London) does not commit to a single mass | shown as a wide range, not one point figure |
| Hand claws | bone core just above 50 cm - longest claws of any known land animal | giantClaw click-fact in the viewer; keratin sheath length estimated |
| When it lived | ~72-66 million years ago (Late Cretaceous, Maastrichtian, possibly late Campanian), Nemegt Formation, Gobi Desert, Mongolia | named 1954 by Evgeny Maleev; holotype PIN 551-483 found 1948 |
How the Therizinosaurus size-vs-human toggle stays honest
The Therizinosaurus model is drawn to a fixed on-screen length so it fits the canvas; the Size vs human control then places a 1.8 m person at the true length ratio used by the viewer (about 9.5 m). Tap Size vs human under the canvas to show or hide the scale figure - the comparison is proportional, not a decorative sticker. Published length still spans about 9-10 m, so the toggle picks one clear scale inside that disclosed range.
What a person would see beside a Therizinosaurus
What a person would see is a bipedal, long-necked herbivorous theropod with dramatically enlarged forelimbs and giant hand claws - turn on the person in the viewer and orbit beside a hind leg or a giant claw to feel how the body sits relative to the scale figure. Skin color is an artistic reconstruction; overall body shape is inferred from more complete relatives (Beipiaosaurus, Nothronychus), and feathering is inferred from Beipiaosaurus, not directly observed on Therizinosaurus.
What the Therizinosaurus size numbers are not
What these size numbers are not is a claim of one precise weight: the Therizinosaurus size comparison discloses the about 9-10 m, 4-5 m, and 5-10 t ranges and uses about 9.5 m only for the Size vs human scale; it does not invent a settled body shape or direct feather fossils for this genus alone, does not claim it was a predator despite the claws, no free-licensed Therizinosaurus glTF is re-hosted yet so the viewer stays procedural with longArms, longNeck and beak, and this is not a win/lose game. For the control walkthrough see how to view Therizinosaurus in 3D. For trade-offs versus phone AR apps see Therizinosaurus 3D viewer vs AR apps.
The Therizinosaurus viewer controls
Open the Therizinosaurus 3D Viewer and wait for the facts panel to fill. Once the status line offers drag to rotate and scroll or pinch to zoom, orbit the model with the pointer and zoom with the wheel or a two-finger pinch. A few controls sit under the canvas beyond the Size vs human toggle described above: Stop rotation freezes the auto-spin, and the label flips to Auto-rotate while spinning is off; Idle motion adds a subtle breathing and leg-sway loop, and tapping it again switches the label back to Stand still; Fullscreen expands the wrapper so every button stays visible beside the scene. Each toggle is independent, so the model can sit still, hold a fullscreen frame, and show the scale figure at the same time.
The Therizinosaurus facts panel and the giant-claw click
Beyond the published-figures table above, the Therizinosaurus facts panel also carries the naming history: Evgeny Maleev first described the fossil in 1954, from a holotype (PIN 551-483) discovered in 1948 in the Nemegt Formation, Gobi Desert, Mongolia. A short click, not a drag, on a giant hand claw swaps in a dedicated giant-claw fact instead of the generic arm note - the one click target unique to this species' facts panel; clicking the head, body, neck, tail, or a leg surfaces its own short note, and clicking empty space in the viewer returns to the full fact sheet.
A herbivore with the most fearsome-looking claws in the collection
Despite carrying the longest claws of any known land animal, Therizinosaurus was a herbivore (high-browser), not a predator - a counterintuitive pairing the facts panel discloses directly rather than letting the claws imply a hunting role; researchers propose the claws served foraging, defense, or display, not predation. The overall body shape shown is inferred from more complete relatives, Beipiaosaurus and Nothronychus, because Therizinosaurus itself is known almost entirely from its arms and claws - a fossil-incompleteness disclosure stronger than any other species shipped in this collection so far, including Carnotaurus, whose main body was known and only the tail and legs were inferred.
Other dinosaurs to compare
Other dinosaurs in the collection make useful size comparisons too: Therizinosaurus is a Late Cretaceous Gobi herbivorous theropod, so for a larger contemporary apex predator see the Tyrannosaurus rex 3D Viewer, or for another Nemegt biped already shipped see the Gallimimus 3D Viewer.
Frequently asked questions
Who named Therizinosaurus, and when?
Evgeny Maleev in 1954, from a holotype (PIN 551-483) discovered in 1948 in the Nemegt Formation, Gobi Desert, Mongolia.
Why does the facts panel call Therizinosaurus a herbivore if it has huge claws?
The giant claws are disclosed as most likely used for foraging vegetation, defense, or display, not hunting - Therizinosaurus was a high-browsing herbivore despite having the most fearsome-looking claws in the collection.
Which body part gives Therizinosaurus its own dedicated fact in the viewer?
A giant hand claw. Clicking it swaps in a dedicated giant-claw fact instead of the generic arm note that other species' forelimbs use.
How complete is the Therizinosaurus fossil record?
Very incomplete for this genus alone - Therizinosaurus is known almost entirely from its arms and claws, so the overall body shape shown is inferred from more complete relatives, Beipiaosaurus and Nothronychus, not from Therizinosaurus's own fossils.
Did Therizinosaurus have feathers?
No feather fossils are known from Therizinosaurus itself; feathering is inferred from quill-like structures on the smaller, more completely known relative Beipiaosaurus.
What do the Stop rotation and Idle motion controls do?
Stop rotation freezes the auto-spin and flips its label to Auto-rotate; Idle motion adds a subtle breathing and leg-sway loop and flips its label to Stand still when tapped again. Both sit under the canvas alongside Fullscreen and Size vs human.
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