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

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Triceratops
Illustration comparing the size of a Triceratops to a human with dimensions for height and length

Triceratops were three-horned herbivorous dinosaurs that roamed western North America in the late Cretaceous period (68-66 Mya). Combined with a shield-like head plate, the horns of the Triceratops were likely used to protect them from predators and may have also been used for mating rituals.

The Triceratops had a length between 26’-29.5’ (7.9-9 m), stood at a height of 9.5’-10’ (2.9-3 m), and had a width of 6.7' (2 m). A typical Triceratops weighed between 13,500-26,500 lb (6.1-12 metric tons).

Drawings of a Triceratops from the side, front, back, and aerial views
Triceratops were three-horned herbivorous dinosaurs that roamed during the late Cretaceous period (68-66 Mya). Combined with head plate, the horns of the Triceratops were used to protect them from predators.

The Triceratops had a length between 26’-29.5’ (7.9-9 m), stood at a height of 9.5’-10’ (2.9-3 m), and had a width of 6.7' (2 m). A typical Triceratops weighed between 13,500-26,500 lb (6.1-12 metric tons).

Drawings of a Triceratops from the side, front, back, and aerial views
Triceratops
Height:
9.5’-10.0’ | 2.9-3 m
Width:
6.7’ | 2 m
Length:
26’-29.5’ | 7.9-9 m
Depth:
Weight:
13,500-26,500 lb | 6.1-12 metric tons
Area:

Period: Late Cretaceous (68-66 million years ago)

Scientific Name
Triceratops

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

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Iguana
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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

Drawings include:
Brachiosaurus 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
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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

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

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