Some animals utter a loud cry. Some are silent, and others have a voice, which in some cases may be expressed by a word; in others, it cannot. There are also noisy animals and silent animals, musical and unmusical kinds, but they are mostly noisy about the breeding season.
Gorillas have a belch vocalization, which is sort of like, 'I'm OK, you're OK.' They do a pig grunt, which is reprimanding. They sing, they laugh, and they hoot, which grows into a chest-beating display.
The sound universe is also spectacular around here. In the evenings there's a cricket orchestra with frogs providing the bass line. In the dead of night the dogs howl about how misunderstood they are. Before dawn the roosters for miles around announce how freaking cool it is to be roosters.
Nature is not silent, and never was a name more derisively inappropriate than when we speak of these non-human creatures who hoot and crow and bray as the dumb animals.
There are about a thousand different variations on a horse neigh. Some of them sound like a horse having sex, some of them like a horse having sad sex.
Game calls can't be just, 'Oh, by the way,' as part of a larger discussion.
In 'Over the Hedge,' I played a bear, and I spent all this time listening to the sounds they make when they fight and mate, when they're angry or happy.
No matter what hyenas sound like, they are not actually laughing.
Young pigs grunt as old pigs grunted before them.