This is some sort of religious animal sacrifice. It is done to appease some imaginary being purported to have special powers a.k.a a god. What's going on here is that it is hard for humans to accept that things happen randomly - some of them terrible. Therefore they are ascribed to the will of a powerful being, which has to be imagined because they can only be seen in altered states of consciousness or perhaps in the dark when our peripheral vision is playing tricks with us.

This type cognitive biases lead to belief systems that Occam's razor would cut off in a second when contemplated by a rational mind. When entrenched these belief systems can cause incalculable harm, sometimes for thousands of years and across continents. In this case, the harm is a whole bunch of dead animals that otherwise could've served as valuable sources of protein. Now they're wasted.

These people are their own worst enemy because of their dysfunctional belief systems. What they need is school.