Belly Buttons

Fact- There are only two species of mammals that lack a belly button: the platypus and the echidna.

Further Info- these mammals lay eggs, thus do not have an umbilical scar

The Platypus

http://www.ansci.wisc.edu/jjp1/ansci_repro/misc/project_websites_08/thur/monotremes/platypus1.jpg

The Echidna

http://rosalieee.files.wordpress.com/2009/08/echidna-dork.jpg

Behind the Scenes- Nothing special