"There was one animal, out of all the animals observed over the years, that would decline to work for food practically every time free food was also an option. This animal, in other words, is a total freeloader. Thatβs right, it was the domestic cat.
It turns out that cats, unlike all other animals, would rather not work for their food if youβre freely giving identical food to them so that it requires no effort on their part. That was the conclusion of a study by Kenneth Koffer and Grant Coulson, as reported in Psychonomic Science in 1971"
Full article here:
http://www.petsadviser.c...-any-other-animal-earth/