Dairy producers are increasingly putting internet-connected collars and ear tags on their cows, helping better track the animals’ health and breeding.

A new H5N1 bird flu mutation has appeared in a cluster of infected dairy cows. It's a genetic change that scientists say could not only make the virus more lethal, but increase its spread between mammals and possibly humans.

Stray feathers litter the ground inside the empty coop at Kakadoodle Farm. A few beige eggshells crunch underfoot. No hens were left alive.