I don't buy it, everyone knows, aliens are interested in cows, not sheep.
Oh... That happens here all the time.
Andropogon gerardii have been at war with sheep for millinia. It was only a matter of time before it spread to Earth. For every sheep killed, thousands of AP have died only to be served as food to their offspring. APs love sunshine and warm summer rains. It is the sheep that are the murderers here.