Platypus

1. They were rare for a while. Not many of them for years as they were killed (fur) or died off - Polution in rivers etc or caught in fishing nets and drum nets (everyone in Aust used to string nets across inland creeks or use Drum nets.) They usually drowned.
2. They are also Very shy and hard to see
3. If you do see them, it is often the plop from them getting into the water or diving.

So Gryph in his usual way managed to get a top photo of one in focus and on the surface.

Apart from odd looking, they are also venomous (the male is anyway) !!!