Dinosaurs | Dinosauria

Dinosaurs are a diverse group of prehistoric reptiles that were the dominant terrestrial animals of the Late Triassic (251.9-201.3 Mya), Jurassic (201.3-145 Mya), and Cretaceous (145-66 Mya) periods. Discovered and studied since the 19th century, dinosaur fossils found around the world have been used by paleontologists to identify over 1,000 different species of dinosaurs. Dinosaurs are commonly categorized by distinctive traits ranging from variations of bipedal (2 legs) or quadrupedal (4 legs), body armor or feathers, herbivorous or carnivorous, and quick or slow movement speeds. Though dinosaurs mysteriously disappeared 65 million years ago, their legacy continues to be popularized in museums, books, films and television.

When did dinosaurs live?

Dinosaurs lived in the Mesozoic Era which took place between 245 and 66 million years ago. The Mesozoic Era is divided into 3 time periods: Triassic (252 to 201 million years ago), Jurassic (201 to 145 million years ago), and Cretaceous (145 to 66 million years ago).

Why were dinosaurs so big?

Paleontologist believe dinosaurs grew so big in order to gain protection from predators, help regulate internal body temperature, and to allow them to reach their source of food. Today, whales are the only animal who are close to the size of dinosaurs.

Where did dinosaurs live?

Dinosaur fossils have been found on every continent, proving that they lived in every environment of the world. During the Triassic period the continents were one supercontinent called Pangea. The continents slowly spread across the world into the arrangement that they are at today.

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Dinosaurs Guides
Browse through our curated Dinosaurs Guides for additional categorizations, tips, details, variations, styles, and histories of Dinosaurs. Guides provide additional insights into the unique properties and shared relationships between elements.
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5'6" | 1.67 m
16' | 4.85 m
Ankylosaurus
167.000
485.000
66000
3D
Ankylosaurus
31’-43’ | 9.4-13 m
8’-11’ | 2.4-3.4 m
59’-69’ | 18-21 m
77,000-123,000 lb | 35-56 metric tons
Brachiosaurus
1300.000
340.000
2100.000
56000.000
61000
3D
Brachiosaurus
11.5' | 3.5 m
46' | 14 m
Plesiosaurus
350.000
1400.000
14000
3D
Plesiosaurus
19.5' | 6 m
6' | 1.83 m
Pterodactyl
600.000
183.000
116000
3D
Pterodactyl
21.5’ | 6.5 m
5.7’ | 1.7 m
49’-51’ | 15-15.6 m
14,100-15,900 lb | 6.4-7.2 metric tons
Spinosaurus
650.000
170.000
1560.000
7200.000
102000
3D
Spinosaurus
14’ | 4.3 m
6’ | 1.8 m
30’ | 9.1 m
11,700-15,400 lb | 5.3-7 metric tons
Stegosaurus
430.000
180.000
910.000
7000.000
90000
3D
Stegosaurus
9.5’-10.0’ | 2.9-3 m
6.7’ | 2 m
26’-29.5’ | 7.9-9 m
13,500-26,500 lb | 6.1-12 metric tons
Triceratops
300.000
200.000
900.000
12000.000
97000
3D
Triceratops
17’ | 5.2 m
6’ | 1.8 m
40’ | 12.3 m
18,500-30,800 lb | 8.4-14 metric tons
Tyrannosaurus
520.000
180.000
12300.000
14000.000
94000
3D
Tyrannosaurus
5'6" | 1.67 m
13' | 3.96 m
Velociraptor
167.000
396.000
157000
3D
Velociraptor
Pterodactyl

The Pterodactyl had a wingspan of roughly 19.5' (6 m) and a body length of 6' (1.83 m).

Drawing comparing the dimensions and size of a Pterodactyl to a man showing height and length

The Pterodactyl had a wingspan of roughly 19.5' (6 m) and a body length of 6' (1.83 m).

Drawing comparing the dimensions and size of a Pterodactyl to a man showing height and length
Pterodactyl
Height:
Width:
19.5' | 6 m
Length:
6' | 1.83 m
Depth:
Weight:
Area:
Scientific Name
Pterodactylus
Lifespan
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Plesiosaurus

The Plesiosaurus had a body length of 46' (14 m) and a typical height of 11.5' (3.5 m).

Illustration comparing a Plesiosaurus to a human diver with dimensions drawn for overall height and length

The Plesiosaurus had a body length of 46' (14 m) and a typical height of 11.5' (3.5 m).

Illustration comparing a Plesiosaurus to a human diver with dimensions drawn for overall height and length
Plesiosaurus
Height:
11.5' | 3.5 m
Width:
Length:
46' | 14 m
Depth:
Weight:
Area:
Scientific Name
Plesiosauria
Lifespan
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Ankylosaurus

The Ankylosaurus had an overall length of 16' (4.85 m) and a standing height of 5'6" (1.67 m).

Size comparison of an Ankylosaurus and a human with dimensions

The Ankylosaurus had an overall length of 16' (4.85 m) and a standing height of 5'6" (1.67 m).

Size comparison of an Ankylosaurus and a human with dimensions
Ankylosaurus
Height:
5'6" | 1.67 m
Width:
Length:
16' | 4.85 m
Depth:
Weight:
Area:
Scientific Name
Ankylosauridae
Lifespan
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Velociraptor | Utahraptor

The Velociraptor had an overall length of 13' (3.96 m) and stood roughly 5'6" (1.67 m) tall.

Comparison drawing of the scale of a Velociraptor to a human showing dimensions of length and height

The Velociraptor had an overall length of 13' (3.96 m) and stood roughly 5'6" (1.67 m) tall.

Comparison drawing of the scale of a Velociraptor to a human showing dimensions of length and height
Velociraptor | Utahraptor
Height:
5'6" | 1.67 m
Width:
Length:
13' | 3.96 m
Depth:
Weight:
Area:
Scientific Name
Lifespan
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Brachiosaurus
Size comparison drawing of the Brachiosaurus to an average human with dimensions shown for length and height

Brachiosaurus was an extremely tall dinosaur that lived during the Late Jurassic period (154-153 Mya). Built for browsing for foliage high above the ground surface, Brachiosaurus is characterized by its long neck and body, small head, and larger forelimbs than hind limbs.

Brachiosaurus is characterized by its long neck and body resulting in a height of 31’-43’ (9.4-13 m), body length of 59’-69’ (18-21 m), and width of 8’-11’ (2.4-3.4 m). A typically Brachiosaurus weighed between 77,000-123,000 lb (35-56 metric tons).

Drawings of a Brachiosaurus from the side, front, back, and aerial
Brachiosaurus was an extremely tall dinosaur that lived during the Late Jurassic with features adapted for browsing for foliage high above the ground surface.

Brachiosaurus is characterized by its long neck and body resulting in a height of 31’-43’ (9.4-13 m), body length of 59’-69’ (18-21 m), and width of 8’-11’ (2.4-3.4 m). A typically Brachiosaurus weighed between 77,000-123,000 lb (35-56 metric tons).

Drawings of a Brachiosaurus from the side, front, back, and aerial
Brachiosaurus
Height:
31’-43’ | 9.4-13 m
Width:
8’-11’ | 2.4-3.4 m
Length:
59’-69’ | 18-21 m
Depth:
Weight:
77,000-123,000 lb | 35-56 metric tons
Area:

Period: Late Jurassic (154-153 million years ago)

Scientific Name
Brachiosaurus
Lifespan

Drawings include:
Brachiosaurus side elevation, front, back, plan

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