Here's "the world's biggest" list of how animal noises are written in the world's languages, from bees to woodcocks, from Danish to Urdu. Pigs are especially great: "øf-øf; knor knor; oink; nöff; groin groin; grunz; röf-röf (pron: reuf-reuf); oink;
boo boo;
hrgu-hrgu ;
oink;
oinc;
nöff-nöff."
(via Dan Hon)