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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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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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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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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Thylacine | Tasmanian Tiger
Dimensioned comparison drawing of the Thylacine compared to an average person

The Thylacine (Thylacinus cynocephalus), now extinct, was one of the largest known carnivorous marsupials. It is commonly known as the Tasmanian Tiger or the Tasmanian Wolf for their canid-like traits and striped lower back. The species was native to Tasmania, New Guinea, and Australia, but the observations made of the animal were made when it was in captivity, and only limited, anecdotal evidence exists of the Thylacine’s behavior in the wild. The Thylacine had a stiff tail, abdominal pouch similar to a kangaroo’s, dark transverse stripes, and round erect ears covered in short fur. It preyed on kanagroos, wallabies and wombats, and birds and other small animals.

Thylacines have a shoulder height of 20”-27” (51-69 cm), body length between 39”-51” (99-130 cm), and an overall weight in the range of 35-65 lb (16-29 kg). The tail of the Thylacine is 20”-26” (51-66 cm) in length. Thylacines have a typical lifespan of 5-7 years in the wild and up to 8-11 years in captivity.

Set of standing side elevation drawings of the Thylacine
The Thylacine (Thylacinus cynocephalus), now extinct, was one of the largest known carnivorous marsupials. It is commonly known as the Tasmanian Tiger or the Tasmanian Wolf for their canid-like traits and striped lower back. The species was native to Tasmania, New Guinea, and Australia.

Thylacines have a shoulder height of 20”-27” (51-69 cm), body length between 39”-51” (99-130 cm), and an overall weight in the range of 35-65 lb (16-29 kg). The tail of the Thylacine is 20”-26” (51-66 cm) in length. Thylacines have a typical lifespan of 5-7 years in the wild and up to 8-11 years in captivity.

Set of standing side elevation drawings of the Thylacine
Thylacine | Tasmanian Tiger
Height:
20”-27” | 51-69 cm
Width:
Length:
39”-51” | 99-130 cm
Depth:
Weight:
35-65 lb | 16-29 kg
Area:
Tail Length
20”-26” | 51-66 cm
Scientific Name
Thylacinus cynocephalus
Lifespan
5-7 years (wild); up to 8-11 years (captivity)

Drawings include:

Thylacine side elevation (standing), front (standing), side (sitting)

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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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