20 Mind-Blowing Animals With Different Colored Blood (2023)

The animal kingdom has amazed us in many ways for centuries. I’ll ask you a simple question. Do all animals have red blood like humans? The answer is simply no. There are a lot of animals with different colored blood, like blue, yellow, purple, etc.

Several respiratory pigments determine these blood colors. In this article, we will discuss animals with different blood colors. So here is the list of 20 mind-blowing animals with distinct colored blood. So let’s start this colorful journey.

20 Animals With Different Colored Blood

1. Sea cucumber

Sea cucumber
Sea cucumber
Genus Holothuria 
Size 10–30 cm
Body color red, black, blue, green, or brown
Blood Color yellow
Geographical location Worldwide

As their name indicates, sea cucumbers are called so because of their cucumber-shaped bodies. Their whole body has tube feet, which they use for locomotion and feeding.

They vary in size from 10 to 30 cm. Their blood color is yellow due to the presence of vanadium-containing pigment. These scavenger animals are found all around the world in different colors.

2. Peanut worms

Peanut worms
Peanut worms
Class Sipuncula
Size 2 to 720 mm
Body color gray or brown
Blood Color Purple
Geographical location throughout the world in deep waters

Spiuncula or peanut worms are a class of marine unsegmented worms. they are known for their long, cylindrical body with extensive introvert or proboscis.

It has an average size of 2 to 720 mm. Let’s talk about their blood color. Their blood is purple in color due to the presence of a protein called hemeerythrin. They are simple body plans with no segmentation or respiratory organs.

3. Bristle worms

Bristle worms
Bristle worms
Class Polychaeta
Size 1mm to 3m
Body color Pink, Tan, Red, Yellow, Brown, Dark Green, and Black
Blood Color Purple
Geographical location throughout the Earth’s oceans at all depths

Polychaeta, or bristle worms, are called so due to the presence of hair-like structures called bristles or setae. They vary in size and color, from 1 mm to 3 m, and occur in many color forms, like pink, tan, red, yellow, brown, dark green, and black.

They have well-developed heads with eyes, antennae, and tentacles. Their blood color is also purple, like peanut worms. These marine creatures occur in all parts of the world and at all depths.

4. Sea squirts

Sea squirts
Sea squirts
Size 0.5 to 10 cm
Body color Clear or brightly colored, usually red, brown, or yellow but sometimes blue
Blood Color Yellow
Geographical location In all seas

The next animal on our list is a sea squirt. They are known for their unique yellow color due to the presence of a vanadium-rich pigment called vanabin. These cylindrical animals vary in size from 0.5 to 10 cm.

They are not free-living, are always present in a group, and remain fixed to the substratum. They are known as tunicates as they have an outer hard covering called a tunic.

These hermaphrodite animals occur in many color forms, usually brightly colored, red, brown, or yellow, but sometimes blue.

5. Roly Polies

Roly Polies
Roly Polies
Genus Armadillidium
Size 8.5 to18 mm
Body color gray to brown
Blood Color Blue
Geographical location All around the world

Armadillidium is a small crustacean known by many names like roly polys, pillbug, woodlice, or potato bugs. They are gray to brown with an average length of 8.5 to 18 mm. These nocturnal creatures primarily prefer humid or moist environments.

They have blue blood because the concentration of copper-containing pigment or hemocyanin is high. They occur in Europe, but now, after introduction to various areas of the world, they are cosmopolitan.

6. Cockroaches

Genus Periplaneta
Size 4 cm
Body color dark reddish-brown
Blood Color white
Geographical location Throughout the world

Cockroach or Periplaneta is the most common pest found across the world. These nocturnal animals are comparatively small with an average length of 4 cm. They are dark reddish brown and their body is divided into three regions; head, thorax, and abdomen.

They have wings but are not long-distance fliers. It contains hemolymph as its respiratory pigment which is pale or white in color. They generally prefer moist environments but can exist in all types of habitats.

7. Ocellated Icefish

Scientific name Chionodraco rastrospinosus
Size 30 to 52 cm
Body color Grayish, black, or brown bodies
Blood Color White/ transparent
Geographical location South Orkney, South Shetland Islands, Antarctic Peninsula, and the Weddell Sea

The ocellated icefish is known for its white or transparent blood. They are found in Antarctica, from South Orkney, the South Shetland Islands, and the Antarctic Peninsula to the Weddell Sea at a depth of 1 km.

They vary in size from an average of 30 to 52 cm. These cold-water fish are usually grayish, with black or brown bodies. They mostly prefer krill to feed on.

8. New Guinea green-blooded skinks

Scientific name Prasinohaema virens
Size 42.5–55.8 mm
Body color Bright lime-green
Blood Color green
Geographical location New Guinea and the Solomon Islands.

As the name indicates, New Guinea green-blooded skinks are known for their green blood. The most interesting thing about their blood is that they use hemoglobin for oxygen transport.

The green color of their blood is due to biliverdin, formed by the breakdown of hemoglobin. They are small, with size of 42.5 to 55.8 mm, and have remarkable bright lime green bodies.

9. Leeches

Genus Hirudinaria
Size 10 to 15 cm long
Body color Olive green to brown
Blood Color Green
Geographical location All continents and seas, except terrestrial Antarctica

We have another green-colored blood segmented worm, i.e., Leeches. These ectoparasitic worms occur on all continents except Antarctica. This animal is commonly seen in the rainy season and prefers a moist environment.

They vary in size from 10 to 15 cm. They primarily feed on the blood of other animals. Their blood contains chlorocruorin, which is responsible for the green color.

10. Horseshoe crab

Horseshoe crab
Horseshoe crab
Genus Limulus
Size 18 to 19 inches
Body color Brownish-green
Blood Color Light blue
Geographical location North America and Southeast Asia.

The horseshoe crab has light blue blood. It is because of the copper-containing pigment called hemocyanin. As the name horseshoe indicates, their head is large and u-shaped, which resembles the horseshoe.

Their blood has medicinal value. Their blood contains Limulus Amebocyte Lysate (LAL) Protein, which pharmaceutical companies use to manufacture drugs.

11. Pale Octopus

Pale Octopus
Pale Octopus
Scientific name Octopus pallidus
Size 35 cm
Body color pale yellowish-orange
Blood Color Blue
Geographical location Southeastern Australia

The octopus also has blue blood. Here we take pale octopus, as its blood contains a high concentration of hemocyanin. These octopuses are pale yellowish orange in color and have a body size of 35 cm.

They are commonly found in southeastern Australia. Apart from their blue blood, their bodies have remarkable spikes all over the body.

12. Emperor Scorpion

Emperor Scorpion
Emperor Scorpion
Scientific name Pandinus imperator
Size 20 cm
Body color Glossy black
Blood Color blue
Geographical location West Africa

Some species of scorpions have blue-colored blood. In this list, we included Pandinus imperator or the Emperor Scorpion, as they contain high concentrations of hemocyanin.

They are beautiful, glossy black, with an average size of 20 cm. They mostly prefer the savannahs of West Africa.

13. Tobacco hornworm

Tobacco hornworm
Tobacco hornworm
Scientific name Manduca sexta
Size 80 mm
Body color Bright green
Blood Color Blue
Geographical location North America

The caterpillars of Manduca sexta are commonly known as tobacco hornworms due to their worm-like appearance and two posterior horns. They are often mistaken for tomato hornworms due to their similar appearance.

These beautiful, bright green-colored worms have blue-colored blood. They are medium-sized, with an average size of 80 mm, and occur in North America.

14. Earthworms

Genus Pheretima
Size 150 mm
Body color Brown
Blood Color Red
Geographical location Southeast Asia

You must have seen an earthworm in your backyard after the rain, right? What’s their blood color? This question must come to your mind. Their blood is red, just like ours.

Their blood contains hemoglobin, which gives it a red color when oxygenated. These segmented worms are approximately 150 mm in length and are commonly found in Southeast Asia and New Guinea.

15. Spiders

Twin flagged jumping spider
Twin flagged jumping spider
Class Arachnida 
Size 0.5 to 90 mm
Body color black, brown, or grey
Blood Color blue
Geographical location All around the world except in polar regions

Spiders are fascinating animals with many distinctive characteristics. Do you know they also bleed blue? Yes, their blood is also blue like that of octopuses.

Their blood contains the copper-containing respiratory pigment hemocyanin, which turns blue when oxygenated. It gives spiders an advantage over infections caused by bacteria and fungi.

Spiders are common in nature, found all across the world except in polar regions, and available in many color forms like black, brown, or grey.

16. Penis worms

Phylum Priapulida
Size 0.3 to 39 cm
Body color Pinkish-brown color
Blood Color purple
Geographical location In all oceans

Priapulida, or Penis worms, are unsegmented worms found in all oceans. They are cylindrical and resemble the shape of a human penis, and their sizes range from 0.3 to 39 cm.

Their blood color is purple, visible under their transparent skin, and gives them a pinkish-brown color. They don’t have well-developed sense organs; just some sense tentacles are present on their whole body, which provide them with information about their surroundings.

17. Squids

Genus Loligo
Size 20 to 50 cm
Body color usually a shade of pink, red, or brown
Blood Color blue
Geographical location Entire Pacific and Atlantic coast, China, India, and the U.S.A

Loligo squid has many fascinating features, but one of the most intriguing is their blood. Their blood is blue due to the same reason: hemocyanin. Let’s talk about their appearance. Their length ranges from 20 to 50 cm, and they exist in many forms in different colors, like pink, red, or brown.

You can find these animals on the Pacific and Atlantic coasts in China, India, and the USA. They are famous among seafood eaters because of their delicious taste and high nutritional value.

18. Brachiopods

Phylum Brachiopoda 
Size 1 to 100 mm
Body color  Yellowish grey color
Blood Color Black or purple
Geographical location Arctic Ocean

Brachiopods are also known as lamp shells because they resemble antique oil lamps. These marine animals are bivalves, which means their soft bodies are covered by two shells.

Their blood color is unique, i.e., black, which makes them an exciting organism to know about. Their blood contains a high concentration of hemeerythrin.

In some brachiopods, the concentration of these pigments is not that high and imparts a purple color. They are very ancient animals that have existed since the Cambrian period, about 540 million years ago.

19. Crayfish

Genus Cherax
Size 5 to 6 inches
Body color Olive green to brown to black
Blood Color Blue
Geographical location Australia

We have another animal with blue blood on this list. Crayfish, or Cherax, are aquatic animals found in Australia. They are large, with a size range of 5 to 6 inches.

These freshwater crayfish can survive in dry conditions through aestivation. They are very colorful organisms and can be seen in olive green, brown, and black. These crayfish have a complex mating system that involves fighting, urine release, and mate choice.

This Australian delicacy is used for human consumption, especially in Australia, is loved by seafood lovers all across the world, and also has medicinal uses.

20. Grasshoppers

Giant Red-winged Grasshopper
Giant Red-winged Grasshopper
Order Orthoptera
Size 1 to 7 cm
Body color Depend on surroundings
Blood Color white
Geographical location on all continents except Antarctica

We covered a lot of articles on different colors of grasshoppers. But have you ever wondered about their blood? Is it also of a different color? So the answer to these questions I will give you.

These beautiful groups of organisms possess hemolymph, just like beetles and cockroaches. This respiratory pigment is transparent and gives a pale white color when oxygenated.

Unlike their same blood color, their body color is different in different species according to their environment, and they are found all across the world on all continents except Antarctica. These organisms have a very special place in insect collections.


In conclusion, the blood color of animals depends on the different respiratory pigments like hemocyanin, vanadin, hemeerythin, etc. to which they adapted during evolution. They have some advantages over hemoglobin-containing blood and also some disadvantages.

They are amazing animals and must need appreciation. I hope you enjoyed reading this. We will be back soon with another article.

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