They're actually being used for ambient sounds in the game Halo. [animals snorting and chirping ... for every possible action, like firing a weapon, driving a tank, or even taking a footstep ...
With the game’s latest Operation, Great Journey, the free-to-play Halo game now has a more classic-feeling gameplay mode in the form of Delta Arena and a brand-new weapon, the MA5K Avenger SMG.
Around 14 holes sit on top of the weapon and each has a razor-sharp crystal needle protruding from it. Users will fire these needles into their enemies, and the needles will cause a bit of damage ...