Extinct | Prehistoric Animals

The earliest Prehistoric animals to live were jawless, spineless creatures that roamed the oceans about 540 million years ago. It wasn’t until the Devonian period, 400 million years ago, when the prehistoric creatures grew legs and left the ocean, these are the prehistoric ancestors to all vertebrate creatures on earth today. Once on land, the prehistoric creatures underwent a bunch of different adaptations for running, crawling, flying, and jumping; it was then when the rise of the dinosaurs took place, in the Triassic period about 230 million years ago. Even though the dinosaurs ruled, many small, rodent-like mammals were alive and these small mammals, along with some birds, amphibians, and reptiles survived the mass extinction that wiped out the dinosaurs. Although 90% of the species that have lived on Earth throughout its existence are extinct, most of the creatures that survived this first mass extinction still exist today.

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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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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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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
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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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Cave Bear
Comparison illustration of the size of a Cave Bear to an average human

The Cave Bear (Ursus spelaeus) was a bear species that lived in the Pleistocene region of Europe and Asia and died in the Last Glacial Maximums about 24,000 years ago. The Cave Bear had a very wide and dome-skull with a steep forehead. Its sturdy body had long thighs, large frame, and turning paws, which made it the ancestor to the Brown Bear in its skeletal form. The size of Cave Bears was like those of the largest modern bears.

Male Cave Bears had a shoulder height between 5’-5’7” (1.52-1.7 m) and a weight in the range of 750-1300 lb (340-590 kg). The shoulder heights of females was between 4’7”-5’2” (1.4-1.57 m) with weights from 500-550 lb (227-250 kg). The Cave Bear had an overall body length of roughly 8’8”-11’6” (2.7-3.5 m) and giant upright standing height of 10’-11’6” (3.05-3.5 m).

Series of side elevation illustrations of the Cave Bear
The Cave Bear (Ursus spelaeus) was a bear species that lived in the Pleistocene region of Europe and Asia and died in the Last Glacial Maximums about 24,000 years ago. The Cave Bear had a very wide and dome-skull with a steep forehead. Its sturdy body had long thighs, large frame, and turning paws.

Male Cave Bears had a shoulder height between 5’-5’7” (1.52-1.7 m) and a weight in the range of 750-1300 lb (340-590 kg). The shoulder heights of females was between 4’7”-5’2” (1.4-1.57 m) with weights from 500-550 lb (227-250 kg). The Cave Bear had an overall body length of roughly 8’8”-11’6” (2.7-3.5 m) and giant upright standing height of 10’-11’6” (3.05-3.5 m).

Series of side elevation illustrations of the Cave Bear
Cave Bear
Height:
4’7”-5’7” | 1.4-1.7 m
Width:
Length:
8’8”-11’6” | 2.7-3.5 m
Depth:
Standing Height
10’-11’6” | 3.05-3.5 m
Weight:
500-1300 lb | 227-590 kg
Area:

Males:

Height (Shoulder): 5’-5’7” | 1.52-1.7 m

Length: 9’10”-11’6” | 3-3.5 m

Weight: 750-1300 lb | 340-590 kg



Females:

Height (Shoulder): 4’7”-5’2” | 1.4-1.57 m

Length: 8’8”-10’6” | 2.7-3.2 m

Weight: 500-550 lb | 227-250 kg

Scientific Name
Ursus spelaeus
Lifespan

Drawings include:

Cave Bear side elevation (standing), front (standing upright)

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