Why does a platypus have a sensitive bill?

The platypus is a very sensitive animal. Although it is able to adapt to a variety of climatic types, from tropical to sub-alpine, it is very sensitive to environmental changes. It is also sensitive in another way: its bill has finely tuned electro-receptors that pick up the tiny electrical impulses from bottom-dwelling crustaceans on river and pond floors, enabling it to scoop them up for food.