Charles Darwin was a busy man.
When he wasn’t advancing his groundbreaking theory of evolution by natural selection, he could be found carefully analyzing the contents of bird vomit and droppings. No, this wasn’t an obscure hobby. He was getting his hands dirty to stack up more evidence to support one of his many hypotheses.
He suspected that some birds had an unusual way of transporting plants to new locations. “Freshwater fish, I find, eat seeds of many land and water plants; fish ar