WOW WHAT AN IMPUT HERE!!!
The total biologies of all kinds of sharks, complete stories written down.
Though I think that one pic says it all; all men are holding padles as we would all reckognise as paddles.
In this other thread 'Sepik region club' Tim already found a book of Hamson with similar clubs, and if one knows all about New Guinea art its Michael Hamson, can tell you!