We may picture tool-using primates or puzzle-solving crows. But my recent research suggests that sheep, goats and alpacas—staples of the barnyard—deserve more credit. In two separate studies ...

Bacon and Sedgwick divide their time between Los Angeles, New York City and Connecticut, where they have a farm complete with four goats, two pigs, three alpacas and three miniature horses.

She hands me Lee’s lead rope and takes the one attached to Joy, the black donkey. We set off across the pasture, passing ...