Noises when feeding (not squeaking)

[IHorseCarzzy5]

My 5 years old pig, Patches, is a lone girl. She is mostly quiet. Whenever I feed her pellets in the morning she greets me at the door and makes and grinding/clicking sound with her teeth, sometimes followed with running around the cage.. Also depending on fast I out pellet in the cage she will hop out.
Anyone know why Patches is grinding/clicking her teeth at me?

 

[Stacey]

Sometimes my boys grind their teeth. I dont think mine do it when i give them food tho but i know Dustin definatley does it. I'm not sure what it means tho :red

Maybe they are like humans and just do it out of habit? I'm bad for grinding my teeth at night.

Sorry not been much help