Peter asked me today about bunyips, an Austrailan mythological creature. I typed bunyip into Google and we found a web site with pictures of four Australian Bunyip stamps, with widely differing portrayals.
Australian aboriginal stories describe the bunyip as an evil spirit which dwells in creeks, swamps, and billabongs. The bunyip's loud bellowing cry terrifies the aborigines. They avoid water sources where they believe a bunyip might live. Some stories suggest the bunyip emerges at night principally to prey on women and children as well as animals.
Peter says The Bunyip looks like a lama, a megatherium, a dragon, a beaver, and a dog (because of it's nose).
See also the Cryptozoology and Philately site.