Blood Color

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What blood of other animals is not red?

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Several animals have blood that is not red due to the use of different oxygen-carrying molecules or pigments. Some examples include:

1. **Blue Blood (Hemocyanin):** In addition to octopuses, many other marine invertebrates, such as lobsters, crabs, and some mollusks, have blue blood. Hemocyanin, which contains copper, gives their blood a blue color when oxygenated.

2. **Green Blood (Chlorocruorin):** Certain annelid worms, such as certain species of polychaetes, have green blood. Their blood contains a green-colored pigment called chlorocruorin, which contains iron and is used to transport oxygen.

3. **Violet Blood (Vanabins):** Some species of sea squirts, or tunicates, have violet blood due to a group of vanadium-based proteins called vanabins. These proteins are used to transport oxygen and give their blood a violet color when oxygenated.

4. **Clear or Yellowish Blood (Hemerythrin):** Hemerythrin is a non-iron-based oxygen-carrying protein found in some marine invertebrates, like certain marine worms and brachiopods. It can give their blood a clear or yellowish appearance when oxygenated.

These variations in blood color are adaptations to different environments and have evolved to efficiently transport oxygen in various species. They highlight the diversity of life on Earth and the ways in which organisms have evolved unique solutions to biological challenges.