Fish Eggs Spread Far and Wide by Waterfowl

How do fish end up in isolated crater lakes or desert lakes, or wetland ponds that pop up temporarily in farm fields during the rainy season? These bodies of water are landlocked–fish should not be there and that’s long baffled biologists. One thing we can say for sure-the fish aren’t flying there. Except, maybe they are, though not on their own steam. They may be hitching a ride in the poop of waterfowl. Andy Green is a professor at Estacion Biologica de Donana in Spain and the University of Manchester in the UK (Segment produced by Krystal Gerber).