Cats also have them. You sometimes see them in the corner of their eye, or partially covering their eyes when they’ve just woken up or are sick or something. They are sort of a translucent milky white.

It’s because they evolved in desert conditions, from what I’ve read. They can see well enough through them but it protects against sand and stuff.

Not to be “that guy”, but technically it’s the fetus’ placenta. It’s formed by the egg, not the mother. So it’s still wrong to say the baby is in its mother’s placenta.

Clay? It’s probably newspaper, tape, and stockings, or brown paper and tape. All his cosplays are low cost.