A few years ago , one of us ( patty brennan ) discovered that these extreme sexual behaviors have sparked an evolutionary arms race between male and female ducks a race that has changed the shape of their reproductive organs .
In africa and india , chickens and ducks are far more likely to be found roaming in people 's backyards , where they can mingle with humans , other domestic animals and wildlife , thus spreading the disease .
Statistics show that by eatingvegetarian food , one could save the lives of 5 cows , 20 pigs , 30 sheep , 760 chickens , 46 turkeys , 15 ducks , 7 rabbits , 2 geese and half a ton of fish .