Sharks (Selachii) are one of the oldest animal species on earth having outlived the dinosaurs with fossil records dating them back 400 million years. Most sharks live in saltwater environments, although two species can survive in freshwater and saltwater. In their ecosystems, the carnivorous shark is usually the top of their food chain, but are being threatened by human activities and hunting. The largest fish in the world is the Whale Shark, capable of growing to 40 feet (12.2 m) in length. Sharks have multiple rows of teeth that are embedded in their gums instead of their jaws, and are constantly losing and replacing their teeth—sharks can lose and replace up to 30,000 teeth in their lifetime.

How many bones do sharks have?

Sharks do not have any bones in their bodies, as their skeleton system is made up of cartilage and connective tissue. This classifies them as Chondrichthyes fish. Cartilage is flexible and has about half of the normal density found in bones.

What do sharks eat?

The diet of a shark varies from shark to shark depending on the species, habitat, and available prey. There are over 400 species of sharks. Most sharks are carnivorous and predators, while some are planktivorous. Sharks aren’t picky and are able to adjust their diet to what is available in order to survive.


How do sharks sleep?

It is not known if sharks are able to sleep, but they do seem to have periods of rest. Sharks need to keep water moving over their gills to receive oxygen. Some sharks need to keep moving all the times to keep water over their gills, while others have spiracles, an opening behind each eye, that allows them to breath while they are still.

Sharks

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Thresher Shark
Dimensioned comparison drawing of the Thresher Shark compared to an average person

The Thresher Shark (Alopias Vulpinus) is a shark species known for its extremely long tail that they use while hunting for food. They can be found along the coasts of North America and Asia in the Northern Pacific Ocean. Thresher Sharks typically eat meat, liver, skin, and fins.

They are not often involved in shark attacks, but are hunted for their skin that is turned into leather and the oil in their liver that can be used for vitamins. Thresher sharks have been identified as vulnerable to extinction since the year 2007.

Thresher Sharks have a total length between 10.5’-20’ (3.2-6.1 m) and an overall weight in the range of 500-775 lb (227-352 kg). The typical lifespan of the Thresher Shark is between 20-50 years.

Set of scaled elevation drawings of the Thresher Shark
The Thresher Shark (Alopias Vulpinus) is a shark species known for its extremely long tail that they use while hunting for food. They can be found along the coasts of North America and Asia in the Northern Pacific Ocean. Thresher Sharks typically eat meat, liver, skin, and fins.

Thresher Sharks have a total length between 10.5’-20’ (3.2-6.1 m) and an overall weight in the range of 500-775 lb (227-352 kg). The typical lifespan of the Thresher Shark is between 20-50 years.

Set of scaled elevation drawings of the Thresher Shark
Thresher Shark
Height:
Width:
Length:
10.5’-20’ | 3.2-6.1 m
Depth:
Weight:
500-775 lb | 227-352 kg
Area:
Speed
Scientific Name
Alopias vulpinus
Lifespan
20-50 years

Drawings include:

Thresher Shark side elevation, side (perspective), front, top

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Basking Shark
Comparison illustration of the size of a Basking Shark to a typical person

The Basking Shark (Cetorhinus Maximus) is the second largest shark, after the whale shark. It has a gray-brown coloring with marble-like skin pattern. They are found in all temperate oceans of the world. Basking Sharks do not hibernate, are active all year, and do not stay in one place for more than a couple months.

During the winter, Basking Sharks swim to deeper waters. Basking sharks are filter feeders that feed passively while swimming and typically eat zooplankton, copepods, barnacles, decapod larvae, fish eggs, and shrimp. The Basking Shark is considered to be endangered.

Basking Sharks have a total length between 22’-35’ (6.7-10.7 m) and an overall weight in the range of 8800-13200 lb (4000-6000 kg). The typical lifespan of the Basking Shark is Up to 50 years.

Scaled collection of drawings of Basking Shark in various poses
The Basking Shark (Cetorhinus Maximus) is the second largest shark, after the whale shark. It has a gray-brown coloring with marble-like skin pattern. They are found in all temperate oceans of the world. Basking Sharks do not hibernate, are active all year, and do not stay in one place for long.

Basking Sharks have a total length between 22’-35’ (6.7-10.7 m) and an overall weight in the range of 8800-13200 lb (4000-6000 kg). The typical lifespan of the Basking Shark is Up to 50 years.

Scaled collection of drawings of Basking Shark in various poses
Basking Shark
Height:
Width:
Length:
22’-35’ | 6.7-10.7 m
Depth:
Weight:
8800-13200 lb | 4000-6000 kg
Area:
Speed
Scientific Name
Cetorhinus maximus
Lifespan
Up to 50 years

Drawings include:

Basking Shark side elevation, side (perspective), front, top

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Tiger Shark
Comparison illustration of the size of a Tiger Shark to a typical person

The Tiger Shark (Galeocerdo Cuvier) is a shark species named for its dark and vertical stripes on its body resembling those of a tiger. They are found in tropical waters specifically around the central Pacific Ocean. Tiger Sharks are solitary and hunt at night.

They are considered one of the world’s most dangerous sharks following the Great White Shark. The diet of the Tiger Shark varies and they eat anything from crustaceans, fish, seals, birds, squid, turtles, sea snakes, dolphins, and even other small sharks. The Tiger Shark is considered a near threatened species due to fishing by humans.

Tiger Sharks have a total length between 10’-14’ (3-4.3 m) and an overall weight in the range of 850-2000 lb (385-907 kg). The typical lifespan of the Tiger Shark is 15-30 years.

Scaled collection of drawings of Tiger Shark in various poses
The Tiger Shark (Galeocerdo Cuvier) is a shark species named for its dark and vertical stripes on its body resembling those of a tiger. They are found in tropical waters specifically around the central Pacific Ocean. Tiger Sharks are solitary and hunt at night.

Tiger Sharks have a total length between 10’-14’ (3-4.3 m) and an overall weight in the range of 850-2000 lb (385-907 kg). The typical lifespan of the Tiger Shark is 15-30 years.

Scaled collection of drawings of Tiger Shark in various poses
Tiger Shark
Height:
Width:
Length:
10’-14’ | 3-4.3 m
Depth:
Weight:
850-2000 lb | 385-907 kg
Area:
Speed
Scientific Name
Galeocerdo cuvier
Lifespan
15-30 years

Drawings include:

Tiger Shark side elevation, side (perspective), front, top

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Lemon Shark
Comparison illustration of the size of a Lemon Shark to a typical person

Lemon Sharks (Negaprion Brevirostris) are sharks recognizable by their yellow skin that helps them camouflage against the sandy waters of their habitat. They live in subtropical waters and are known to return to specific nursery sites to breed. Lemon Sharks often feed at night and use electroreceptors to find their prey.

They eat a variety of fish, rays, crustaceans, seabirds, and other sharks. Lemon sharks live in groups that allow them to have communication, courtship, and protection among one another. They are near threatened with extinction.

Lemon Sharks have a total length between 7.5’-11’ (2.3-3.4 m) and an overall weight in the range of 190-400 lb (86-181 kg). The typical lifespan of the Lemon Shark is 25-35 years.

Scaled collection of drawings of Lemon Shark in various poses
The Lemon Shark (Negaprion Brevirostris) are recognizable by their yellow skin that helps them camouflage against the sandy subtropical waters of their habitat. They are known to return to specific nursery sites to breed. Lemon Sharks often feed at night and use electroreceptors to find their prey.

Lemon Sharks have a total length between 7.5’-11’ (2.3-3.4 m) and an overall weight in the range of 190-400 lb (86-181 kg). The typical lifespan of the Lemon Shark is 25-35 years.

Scaled collection of drawings of Lemon Shark in various poses
Lemon Shark
Height:
Width:
Length:
7.5’-11’ | 2.3-3.4 m
Depth:
Weight:
190-400 lb | 86-181 kg
Area:
Speed
Scientific Name
Negaprion brevirostris
Lifespan
25-35 years

Drawings include:

Lemon Shark side elevation, side (perspective), front, top

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Zebra Shark
Dimensioned comparison drawing of the Zebra Shark compared to an average person

The Zebra Shark (Stegostoma Fasciatum) is a species of shark that is distinguished by the 5 ridges that stretch along their body and black spots on their skin. They are sometimes visually confused for the leopard sharks. This species of sharks generally lives in the Indo-Pacific coral reefs.

Zebra Sharks are nocturnal and spend most of the day resting on the sea floor. Their diet is made up of mollusks, crustaceans, fishes, and sea snakes. They are solitary for most of the year. Zebra Sharks are considered endangered and highly vulnerable to extinction as they are hunted for their skin and liver oil.

Zebra Sharks have a total length between 6.5’-11.5’ (2-3.5 m) and an overall weight in the range of 45-65 lb (20-30 kg). The typical lifespan of the Zebra Shark is between 20-30 years.

Set of scaled elevation drawings of the Zebra Shark
The Zebra Shark (Stegostoma Fasciatum) is a species of shark that is distinguished by the 5 ridges that stretch along their body and black spots on their skin. They are sometimes visually confused for the leopard sharks. This species of sharks generally lives in the Indo-Pacific coral reefs.

Zebra Sharks have a total length between 6.5’-11.5’ (2-3.5 m) and an overall weight in the range of 45-65 lb (20-30 kg). The typical lifespan of the Zebra Shark is between 20-30 years.

Set of scaled elevation drawings of the Zebra Shark
Zebra Shark
Height:
Width:
Length:
6.5’-11.5’ | 2-3.5 m
Depth:
Weight:
45-65 lb | 20-30 kg
Area:
Speed
Scientific Name
Stegostoma fasciatum
Lifespan
20-30 years

Drawings include:

Zebra Shark side elevation, side (perspective), front, top

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