Things generally don't have belly buttons.
All placental mammals have belly buttons.
No, plants don't have belly buttons
No, people do not store things in their belly buttons, but I do believe it is possible to store a small amount of food in the human belly button.
Yes in fact all mammals have belly buttons which is super fascinating but they are straight unlike our human belly buttons!
Yes! all mammals have belly buttons. When we are growing in our mothers belly we are joint by an umbilical cord then when we have been born the umbilical cord gets cut and that is why we have belly buttons.
Yes they do, though they are hard to see. See the article from Discover Mag for some interesting facts - including about belly buttons - in the link below. Rats were not delivered in a different way - they are mammals and have an umbilical cord as well. All mammals have bellybuttons
they have belly buttons because they have them okii
Yes, hamsters do have belly buttons
All mammals have belly buttons so yes pigs have belly buttons and so do elephants.
No. Only mammals have belly buttons.
yes. all live births do.
All placental animals have belly buttons.
Oh, but they do have belly buttons.