Eli5 How do animals like fish or squids become completely see through including their organs and blood.

Question

Eli5 How do animals like fish or squids become completely see through including their organs and blood.

In: Biology

Answer 1

They’re already about 90 percent water so all the tissues and organs are made super thin so light passes through. Notice that larger animals don’t do this, besides structural issues, there’s just too much stuff to be transparent.