Jen

“Immanuel Birmelin, an ethologist at the Society of Animal Behavior Research in Germany, explained how patient he’d had to be in order to run a test to see if cats can count: “One of the cats would do the test once in the morning—only!” he recalled. “Another would do it once in the afternoon—only!” It had taken him four years to show that cats can count to four.”
― Virginia Morell, Animal Wise: The Thoughts and Emotions of Our Fellow Creatures