Other vocal communications include grunts, woofs, snarls, miaows, hisses and growls. Death metal vocals are referred to as death growls; hoarse roars/snarls. They produce a number of vocalizations, including growls, snarls, meows and purrs. Honks, roars and snarls are made during low-intensity agonistic encounters. Female koalas bellow, though more softly, in addition to making snarls, wails, and screams. They can talk, but the viewer would hear incoherent grunts and snarls. Infrastructural bottlenecks including traffic snarls, road congestions, water scarcity and pollution are on the rise. Katie slams the door shut as Old Yeller snarls and tries to attack. Milton laughs at him off-stage, until the circus keeper snarls back at him. The violence led to severe traffic snarls during the morning rush hour. Since the traffic volume is very low, seldom it results in traffic snarls. The preparation for the 1982 Asian Games had caused traffic snarls in the city. It's one note, but it's so melodic, and it just snarls with attitude and anger. Wolves and big cats largely use snarls and body posture to convey their threat. The Reverend snarls as Hugh and Ally walk away.