NYABUNG MANUK

A traditional game that the Iban universally play in Sarawak is cockfighting, a game said to be first played by the deities.

 As this game was, and is, the traditional sport of the spirits and deities, it must also be held at all major religious festivals to please the gods who are believed to be spiritually present.4 Because of the importance of cockfighting to the Iban mind, there exists an elaborate terminology particularly for the colorations of plumage, and it is believed that there are special times when it is best to fight each rooster according to its colouration.

Here's a sample video of how it works,