Barking while popcorning??

[CavyMama]

I was watching the new, yet to be named, pig last night and he makes the funniest sound sometimes. He will popcorn around and sometimes make what sounds like a quick "bark" as he pops. Maybe this sound is more common than I think but none of my others have made this sound so when I heard it, I thought it was kind of unusual.

[Peggysu]

Mine make a Whoop wheek when they popcorn, no "bark" so to speak.

[fieryone]

Mine don't make a bark sound, but my Lola does sound like a dog's squeaky toy when she popcorns. She's the only one that makes a sound.