Reptiles are a cold-blooded vertebrate animal class that regularly sheds their outer layer of skin, yet are also very similar to birds (in fact, the crocodile is more closely related to a bird than to a lizard). Reptiles are not as old as fish, with the earliest reptile on record emerging 315 million years ago, but they were the dominant class during the Mesozoic age until the extinction of the dinosaurs. Like birds, reptiles are an air-breathing class with many of its species laying eggs instead of giving birth to live young. In fact, out of all the reptiles, the only species to give birth to live young are boas and pythons. Being cold-blooded without the ability to regulate their internal temperature, Reptiles become inactive during the cooler times of the year.

Reptiles Guides
Browse through our curated Reptiles Guides for additional categorizations, tips, details, variations, styles, and histories of Reptiles. 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
27.0”-36.0” | 69-91 cm
48.0”-60.0” | 122-152 cm
330-550 lb | 150-250 kg
100-150 (wild), 175 (captivity)
Galápagos Giant Tortoise
91.000
152.000
250.000
175.00
1100
3D
Galápagos Giant Tortoise
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
14’-23’ | 4.25-7 m (Male); 7.5’-11’ | 2.30-3.35 m (Female)
880-2200 lb | 400-1000 kg (Male); 180-220 lb | 82-100 kg (Female)
70-100 (wild); 100-120 (captivity)
Saltwater Crocodile
700.000
1000.000
120.00
31000
3D
Saltwater Crocodile
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
Iguana
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Scientific Name
Lifespan
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Stegosaurus
Size comparison drawing with dimensions of a Stegosaurus and an average human

Stegosaurus was a Late Jurassic (155-150 Mya) herbivorous quadrupedal dinosaur known for its array of upright plates on its back and strong spiked tail. Heavily built with short limbs, a small head, and large body, Stegosaurus was a defensive dinosaur that likely foraged for twigs and low hanging fruits.

Stegosaurus had a body length of 30’ (9.1 m), a height of 14’ | 4.3 m, and a width of 6' (1.8 m). Stegosaurus typically weighed between 11,700-15,400 lb (5.3-7 metric tons).

Drawing collection illustrating the front, back, side, and plan profiles of a Stegosaurus
Stegosaurus was a Late Jurassic herbivorous quadrupedal dinosaur known for its array of upright plates on its back and spiked tail.

Stegosaurus had a body length of 30’ (9.1 m), a height of 14’ | 4.3 m, and a width of 6' (1.8 m). Stegosaurus typically weighed between 11,700-15,400 lb (5.3-7 metric tons).

Drawing collection illustrating the front, back, side, and plan profiles of a Stegosaurus
Stegosaurus
Height:
14’ | 4.3 m
Width:
6’ | 1.8 m
Length:
30’ | 9.1 m
Depth:
Weight:
11,700-15,400 lb | 5.3-7 metric tons
Area:

Period: Late Jurassic (155-150 million years ago)

Scientific Name
Stegosaurus
Lifespan

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

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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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Spinosaurus
Comparison drawing of a Spinosaurus and a human with dimensions for height and length

Spinosaurus was a large carnivorous Cretaceous period (112-93.5 Mya) dinosaur characterized by its large thin back spikes. A giant predator on both land and water, similar to the present day crocodile, fossils prove that the Spinosaurus was as larger or larger than the Tyrannosaurus Rex.

Spinosaurus had a length of 49’-51’ (15-15.6 m), a head height of 16.5’ (5 m), an overall spine height of 21.5’ (6.5 m), and a width of 5.7' (1.7 m). Spinosaurus weighed 14,100-15,900 lb (6.4-7.2 metric tons).

Collection of drawings of a Spinosaurus from the front, back, side and plan views
Spinosaurus was a large carnivorous Cretaceous period dinosaur characterized by its large thin back spikes.

Spinosaurus had a length of 49’-51’ (15-15.6 m), a head height of 16.5’ (5 m), an overall spine height of 21.5’ (6.5 m), and a width of 5.7' (1.7 m). Spinosaurus weighed 14,100-15,900 lb (6.4-7.2 metric tons).

Collection of drawings of a Spinosaurus from the front, back, side and plan views
Spinosaurus
Height:
21.5’ | 6.5 m
Width:
5.7’ | 1.7 m
Length:
49’-51’ | 15-15.6 m
Depth:
Weight:
14,100-15,900 lb | 6.4-7.2 metric tons
Area:

Height (Head): 16.5’ | 5 m

Period: Cretaceous (112-93.5 million years ago)
Scientific Name: Spinosaurus

Scientific Name
Lifespan

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

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Tyrannosaurus | T-Rex
Tyrannosaurus | T-Rex size comparison to a human with dimensions for overall height and length

Tyrannosaurus Rex (T-Rex) was one of the largest predatory dinosaurs that ever existed. Living during the Cretaceous period (68-66 Mya) in the forested river valleys of today’s western North America, Tyrannosaurus is a carnivore popularly known for its large 5’ | 1.5 m skull, ferocious serrated teeth, small useless arms, strong tail, and powerful bipedal legs.

Tyrannosaurus Rex was 40’ (12.3 m) in length, with a height of 17’ (5.2 m), width of 6' (1.8 m), and hip height of 12’-13’ (3.7-4 m). Tyrannosaurus Rex weighed roughly 18,500-30,800 lb (8.4-14 metric tons).

Side, front, back and plan drawings of a Tyrannosaurus | T-Rex
Tyrannosaurus Rex (T-Rex) was one of the largest predatory dinosaurs that ever existed. Living during the Cretaceous period (68-66 Mya), Tyrannosaurus is a carnivore popularly known for its large skull, ferocious serrated teeth, small useless arms, strong tail, and powerful bipedal legs.

Tyrannosaurus Rex was 40’ (12.3 m) in length, with a height of 17’ (5.2 m), width of 6' (1.8 m), and hip height of 12’-13’ (3.7-4 m). Tyrannosaurus Rex weighed roughly 18,500-30,800 lb (8.4-14 metric tons).

Side, front, back and plan drawings of a Tyrannosaurus | T-Rex
Tyrannosaurus | T-Rex
Height:
17’ | 5.2 m
Width:
6’ | 1.8 m
Length:
40’ | 12.3 m
Depth:
Weight:
18,500-30,800 lb | 8.4-14 metric tons
Area:

Height (Hips): 12’-13’ | 3.7-4 m

Period: Cretaceous (68-66 million years ago)

Scientific Name
Tyrannosaurus
Lifespan

Drawings include:
Tyrannosaurus | T-Rex side elevation, front, back, plan

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