We have specifically covered what are essentially giant bats usually mistaken for Chupcabras and/or gargoyles. So this certainly conforms to what we have so far and supports the Bat conjecture for all of it along with its harvesting of arterial blood.
Also it is part of the Great Plains and the huge herds of cattle that are available.
I wonder if a single bat can feed of a single cow without killing it? That actually makes sense as a cow has around ten gallons of blood. Most likely the dead cows were bled by a whole flock who mostly took turns draining the blood.