Why do storks have long beaks?

The platypus does not have a beak. It has a bill.

The platypus's bill is covered with thousands of tiny electroreceptor cells, which enable it to detect the electrical impulses of tiny water-dwelling creatures. Once detected, the platypus then uses its bill to shovel the mud and get to the creatures, which form its main food source. When eating, the platypus uses grinding plates in its long bill to crush the food before swallowing, as it does not have teeth.