Did Freya the Goat Discover Perpetual Motion?

When I go to milk the goats, sometimes one teat is emptier than the other. It's rarely the same side on the same goat. I'm suspicious.

Especially because two years ago I was hanging out in the goat pen when I saw Freya stroll over to her sister Pumpkin and take a drink of milk from Pumpkin's udder. Is Freya drinking from other goats? Then I need to vote her off the island. Have the goats learned to drink their own milk? Then I need to invest in goat-resistant brassieres for the whole herd.

She looks so innocent, doesn't she?

For now, I'm getting more milk than we need, so it's not a big deal. But if you want to hang out in the goat pen and solve the mystery, there's some goat cheese in it for you.