Ecological Society of America

Quick: What does a [insert sea creature here] like for lunch? Peanut butter and jellyfish sandwiches, of course. While you could insert sharks, swordfish and tuna in that joke, up until recently, you would have left penguins out because no one thought they ate jellyfish. Turns out, we've been wrong.

Animals and plants have one of the most ideal relationships in nature. The plants feed the animals and the animals, in turn, spread the seeds of the plants through excrement. But when tree-climbing goats in Morocco eat the fruit of the argan tree, the seed is spread in more-or-less the opposite way.