Short answer
Alpacas hum, give a loud alarm call, cluck, snort, scream when fighting, and males 'orgle' while mating.
Humming: contact and mild emotion. Alarm call: a high, braying, repetitive sound when a predator (often a dog) is spotted. Clucking: a soft tongue-click used by mothers and friendly males.
Snorting and grumbling: mild annoyance. Screaming: during fights or when cornered. Orgling: the gargling song of a mating male — a sound many first-time owners never forget.
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