Hi Allen,

I can't add to what's already been suggested, but will offer this
for your entertainment

http://www.dailymail.co.uk/sciencetech/article-2318495/Gasping-drink-Ultras=
onic-popping-sound-trees-thirsty-heard-time.html

Scientists believe they have made the first ever recording of a tree
gasping for water.

Just as humans make a noise as they desperately try to gulp air,
living trees make ultrasonic popping noises as they draw in as
much moisture as possible to survive during a drought

Joe

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