One hundred and fifty one years ago, Charles Darwin and Alfred Russel Wallace knew that birds dropping from the skies, dead fish and crabs washing up from the sea, and cows flopping in the fields, are nature’s spectacular staging of what Darwin termed natural selection. Darwin wrote, “As many more individuals of each species are born than can possibly survive; and...

Dead crabs and fish wash up on shores, dead birds drop from the skies, dead cows and water buffaloes drop in the fields, and dead bats drop in caves, and under bridges. One hundred and fifty one years ago, Charles Darwin and Alfred Russel Wallace were aware that birds dropping from the skies, dead fish and crabs washing up from the sea, and cows and water buffaloes flopping...