Also, you can kill gobbles in the sewers. Gobble ears are traded for better money than rat parts. And they also sometimes give money.

After killing rats and gobbles press " l" and it will enable you to loot whatever they had on them.
There is a potion maker on the top level of the arena. I don't remember her name but she is a Demorian woman. You can sell all your animal ( gobble& rat) parts to her.

Good luck,

Veryawen ( another newcomer to Yllakum)