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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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

Drawings include:
Tyrannosaurus | T-Rex 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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Velociraptor | Utahraptor

The Velociraptor had an overall length of 13' (3.96 m) and stood roughly 5'6" (1.67 m) tall.

Comparison drawing of the scale of a Velociraptor to a human showing dimensions of length and height

The Velociraptor had an overall length of 13' (3.96 m) and stood roughly 5'6" (1.67 m) tall.

Comparison drawing of the scale of a Velociraptor to a human showing dimensions of length and height
Velociraptor | Utahraptor
Height:
5'6" | 1.67 m
Width:
Length:
13' | 3.96 m
Depth:
Weight:
Area:
Scientific Name
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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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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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