You see the cranes. They have got big beaks. Why? Because they have to catch fish from within the water, so the beak must be very long. So there is facility. The hog has different mouth, because he has to eat stool. So a different kind of body.
So these bodies means we have manufactured according to our different mentality. Kṛṣṇa says that, "You stop all this business. Simply you are migrating, or transmigrating, from one body to another or one planet to another. That will not make you happy." Sarva-dharmān: "You just surrender unto Me. Because you are meant . . . your original creation is meant for serving Me." Just like this body.
When this body was made in the womb of my mother, it was just like a small pea, and from that pea, different holes came out, then hand came out, leg came out, the fingers came out. Why this finger was created? Because I require the service of the fingers. Suppose if I want to press something, if there was no nail, then I cannot press. It is so nicely manufactured. By my energy, by my desire, and nature supplying me ingredient, it is manufactured.