Pigs
“Other behaviors showcase pigs' ability to learn new behaviors. Using their snouts, pigs can even be taught to maneuver a modified joystick to move a cursor on a video monitor, as proven in research done at Penn State from 1996 to 1998 by Stanley Curtis, then professor of dairy and animal science and now an adjunct animal sciences professor at the University of Illinois.
For rewards of M&M's, Skittles or Reese's Pieces, the pigs moved the cursor over to a target, then used the cursor to distinguish among scribbles drawn by Curtis' grandchild. The pigs were shown one scribble, then a few seconds later shown the same scribble along with a second. They used the joystick and cursor to distinguish between the scribble they had seen before and the one they were seeing for the first time.
The pigs learned these tasks within 5 to 10 attempts, "very quickly," says Curtis. "As quickly as chimpanzees.""
From PSU Article
I'm also going to throw this quote in here too. “A PETA investigation found that workers at an Oklahoma farm were killing pigs by slamming the animals’ heads against the floor and beating them with a hammer.(34)” This, from PETA. Honestly?
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