And Lassie went round helping people in trouble. Beth Yes. Well, if you watched Lassie as a child, you might also remember the TV shows, Flipper the Dolphin, and Skippy the Kangaroo.

Robert T. Paine, Food Web Complexity and Species Diversity, The American Naturalist, Vol. 100, No. 910 (Jan. - Feb., 1966), pp. 65-75 ...