But can they handle calculus?

• Position: Birds - Brief article

It's long been known that pigeons can count. But new research shows that they can also grasp more-abstract math that until now has been associated only with monkeys and other primates. After a year of training with scientists, a group of pigeons learned to rank sets of one, two, and three items in their correct order (and to indicate their choices by pecking at the objects on a digital screen). Even more impressive, after learning that two is more than one and three more than two...