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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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
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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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Galápagos Giant Tortoise
Dimensioned size comparison drawing of a Galápagos Giant Tortoise compared to the size of an average person

The Galapagos Giant Tortoise, also referred to as the Galapagos tortoise, inhabits only two remote archipelagos: the Galapagos Islands 1000 km west of mainland Ecuador, and Aldabra in the Indian Ocean, 700 km east of Tanzania. They are the largest living species of tortoise, with tortoises on islands with humid highlands being larger with domed shells and short necks. Tortoises on islands with dry lowlands tend to be smaller. Distinguishing characteristics include a large bony shell of a dull brown or gray color that can hold its head, neck, and fore limbs when drawn back for protection. The Galapagos tortoise is an herbivore that consumes a diet of cacti, grasses, leaves, lichens, berries, oranges, and milkweed.

The typical Galápagos Giant Tortoise has an overall height of 27.0”-36.0” (69-91 cm) and body length of 48.0”-60.0” (122-152 cm). An average Galápagos Giant Tortoise weighs between 330-550 lb (150-250 kg) and has a typical lifespan of 100-150 (wild), 175 (captivity).

Series of elevation and plan illustrations of a Galápagos Giant Tortoise in various positions
The Galapagos Giant Tortoise is the largest living species of tortoise and inhabits only two remote archipelagos. Distinguishing characteristics include a large bony shell of a dull brown or gray color that can hold its head, neck, and fore limbs when drawn back for protection.

The typical Galápagos Giant Tortoise has an overall height of 27.0”-36.0” (69-91 cm) and body length of 48.0”-60.0” (122-152 cm). An average Galápagos Giant Tortoise weighs between 330-550 lb (150-250 kg) and has a typical lifespan of 100-150 (wild), 175 (captivity).

Series of elevation and plan illustrations of a Galápagos Giant Tortoise in various positions
Galápagos Giant Tortoise
Height:
27.0”-36.0” | 69-91 cm
Width:
Length:
48.0”-60.0” | 122-152 cm
Depth:
Weight:
330-550 lb | 150-250 kg
Area:
Scientific Name
Chelonoidis nigra
Lifespan
100-150 (wild), 175 (captivity)

Drawings include:
Galápagos Giant Tortoise side elevation, side (person), side (walking), front, plan

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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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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

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

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