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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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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Brachiosaurus
Size comparison drawing of the Brachiosaurus to an average human with dimensions shown for length and height

Brachiosaurus was an extremely tall dinosaur that lived during the Late Jurassic period (154-153 Mya). Built for browsing for foliage high above the ground surface, Brachiosaurus is characterized by its long neck and body, small head, and larger forelimbs than hind limbs.

Brachiosaurus is characterized by its long neck and body resulting in a height of 31’-43’ (9.4-13 m), body length of 59’-69’ (18-21 m), and width of 8’-11’ (2.4-3.4 m). A typically Brachiosaurus weighed between 77,000-123,000 lb (35-56 metric tons).

Drawings of a Brachiosaurus from the side, front, back, and aerial
Brachiosaurus was an extremely tall dinosaur that lived during the Late Jurassic with features adapted for browsing for foliage high above the ground surface.

Brachiosaurus is characterized by its long neck and body resulting in a height of 31’-43’ (9.4-13 m), body length of 59’-69’ (18-21 m), and width of 8’-11’ (2.4-3.4 m). A typically Brachiosaurus weighed between 77,000-123,000 lb (35-56 metric tons).

Drawings of a Brachiosaurus from the side, front, back, and aerial
Brachiosaurus
Height:
31’-43’ | 9.4-13 m
Width:
8’-11’ | 2.4-3.4 m
Length:
59’-69’ | 18-21 m
Depth:
Weight:
77,000-123,000 lb | 35-56 metric tons
Area:

Period: Late Jurassic (154-153 million years ago)

Scientific Name
Brachiosaurus

Drawings include:
Brachiosaurus 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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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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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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