One day I set out berry harvesting. While harvesting I seemed to have gained the intrest of these little creatures. They must have thought I was picking the berries for them because they kept taking them and then deciding to be my friend. It wasn't until after I had gained a small pack that I realized they always take from the last inventory slot and I had a certain berry there. They now live very comfortably with plenty of berries so they don't have to steal.