Mass deaths of animals and birds

During WWII, the Japanese Army was up to inventing the death ray device. It seems the recent mass deaths of the animals or birds around the world seems to be the similar invention. What if the similar device is used for the human testing? I bet it would be like the death of an entire village. When it happens, the government can announce it as the suicidal criminals with either group of cult or having mental health records to hide their experiments. Small scale cult group suicides happened several places around the world. It could be the minor level testing - controlling of the leader with V2K/channeling to persuade the killing by their own or FBI stepping in and causing more deaths from the side effects (e.g. Wako mass death). If the people just commit suicide from the selected cliffs or towards the deep hole on the ground, it can help cleaning up the area during the war. If the army has the weapon to send all humans to one place, it can simply sending the people off from a cliff to the sea. The result would be no human remains inside of the village. And the army will not have a responsibility for the disappearance of the villagers. It's a clean war without using a weapon causing the victim to spill one's blood out.

Cows have been the victim of cattle mutation by the UFO in the past. Now they are counted as the part of the mass killing animal victims. I bet this phenomenon is creating less food for the world population.