longevity. The best predators were built for speed and used intelligence. Cunning.
Something like that, slow moving and as dumb as a brick, seems either like prey for something else or an animal that everything ignores as a non-threat, like a sloth or something.
Most likely a herbivore or omnivore, definitely not a pure carnivorous animal. The walking dead type zombie could never have evolved in nature. It had to have been caused by a poorly designed virus or lab grown organism of some kind.
These fuckers though… they are ferocious, fast and agile. Not too smart though… but they are smart enough to work as a collective. It’s better to avoid the larger groups because of that…