The lonely hoo-ing of a Mourning Dove.

Roe Deer barking to each other in the woods late at night.

I feel like someone should offer him a throat lozenge.

:p

Some of the larger deer sound freakin' scary when they start, especially when they're close by and I can hear them running around. I love listening to the other deer reply, too, from another part of the wood :nod:

The absolute silence after a snowfall on a cloudless night. It's like everything is holding it's breath.

Children laughing and playing in an open field.

The hooting of a distant owl in the early morning.

a very active thunder storm with the attendant smell of burned ozone

the crash of waves during a storm .... or the gentle lap of incoming waves on a gentle-sea day.

Listening to the quail call of an evening
the call of a whippoorwill

Darn, fzzy, you took two of my favorite sounds (even including the smell that immediately follows the CRACK of nearby lightning).

OK, so here's a few more:

The incessant rumble of a waterfall (together with the mist coating you as you stand below it).

The honking of a large formation of Canadian Geese as they fly above you.

The gentle rustle of a kayak's paddle as it slices through the water.

Not necessarily a nature sound that I like so much, but we recently heard a fox's cries in our neighborhood...if you've never heard one, it sounds like a child crying or a woman screaming...very, very creepy :eek:

Scary enough to not want to let my little dog outside.

The drumming sound of a woodpecker.

Mostly all of the above except the roe deer and fox the only foxes I've seen are silent

Foxes stay silent until nightfall when nobody can see them vocalizing. We've seen the fox in our neighborhood, & we've heard it, but never at the same time. That's why it's such a creepy sound.