The Return Of The Living Dead -

They can use radios to "send more paramedics" and coordinate ambushes.

Before Dan O'Bannon wrote and directed this film, zombies were generally understood to be stopped by a shot to the head. O’Bannon threw that rulebook out. In this universe, zombies are: The Return of the Living Dead

While Romero’s films are social satires, The Return of the Living Dead is a cynical scream. It ends on one of the most bleakly funny notes in horror history, suggesting that no matter how hard you fight, the bureaucracy of the military and the persistence of chemistry will eventually turn everyone into a snack. They can use radios to "send more paramedics"

Dismembering them just creates multiple moving parts; burning them creates toxic smoke that causes more zombies. The Return of the Living Dead