Animal world is blue

Sea ducks can attract the enemy more easily thanks to blue legs or grouper changing their body color to green when they are old.

1. Sea ducks

Some blue parts of the animal body, usually on the face, are an advantage to attract the enemy of some species. However, sea ducks in Central and South America have green parts as legs. The blue color of the sea duck feet is formed by a kind of fresh fish that they usually eat. According to the researchers, the darker the green on the propeller, the healthier they are and more opportunities to flirt or attract the other. (Photo: Corbis)

2. Frog

The breeding season of red-brown frogs in Europe and Asia often takes place very quickly. During this time, male frogs can turn green in a few days. Researchers believe that when the color changes to a temporary green, male frogs can quickly recognize gender and do not spend much time mating with other males. (Photo: Corbis)

3. Grouper

For many bisexual animals, blue body is not a way to distinguish sex. However, in Australia's eastern blue grouper, when a female becomes a male, it changes its body color to blue. When born, these fish are all females and are green. Their bodies turn brown in adulthood. As they age, they turn into males and are green in the image. (Photo: australianmuseum.net.au)

4. Blue lobster

American blue-green lobster changes its body color to green due to genetic mutation. Genetic mutations can cause lobsters of different colors such as yellow, albino or red. However, the mutation rate that changes color in shrimp is often very low. (Photo: Natural History Museum)

5. Slugs

Green slugs are native to the Pacific Northwest region. Green slugs are now classified as endangered species. Scientists say they have yet to find out the reason why this snail has a green body. According to recent studies, green slugs are fungi-eating species and can distribute fungal spores in forests. (Photo: tomhawthorn.blogspot.com)