How do saltwater creatures avoid dehydration?

Question

Do they purify the water within themselves?

In: Biology

Answer 1

A wide variety of ways, specialized kidneys that filter out salt, specialized gills that filter out salt, excessive urination, albatrosses have specialized ducts that secrete high concentration salty tears so to speak, specialized glands in the rectum, sharks use urea secreted by glands. I’m sure I’m missing other ways they deal with salt filtering and excretion.