Summary: Donna's a city girl, she doesn't belong around livestock.
“Nothing to worry about,” the Doctor assured Donna. “They’re harmless herbivores, they won’t hurt you.”
Donna wasn’t so sure. The creatures were massive, twice the size of cows, and she didn’t want to get trampled beneath their enormous feet.
“They’re coming this way!”
“Stand still, they’ll go around… I wouldn’t go that way if I were you!”
Donna wasn’t listening. Scrambling up and over the tall gate, intent on reaching safety, she started across a stretch of what looked like concrete, only to break through the crust and end up knee-deep in muck.