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.

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Reptiles

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Pythons
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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

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Triceratops side elevation, front, back, plan

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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
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5'6" | 1.67 m
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Length:
16' | 4.85 m
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Area:
Scientific Name
Ankylosauridae
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Iguana
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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
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Weight:
Area:
Scientific Name
Pterodactylus
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