Wailing Jhonny

From publisher blurb:

When you hear their shriek, you know you’re being hunted….

Using echolocation, the enormous, bear sized Wailing Jhonny haunts the twisted woodlands and tangled wastes of the new era. People forced to live near these creatures know well enough to stay the hell out of the woods at night, and lock up their families and livestock. Prowling alone or in packs, these mutated bat-like creatures are voracious omnivores which appear in both a standard and wildly mutated variety.