In addition to Scottie's post, I'll offer up the following:
Here is a list of various sounds and decibels --
Faintest audible sound 0 dB
Human whisper (at 1 m) 20 dB
Human conversation (at 1 m) 60-70 dB
Power saw (at 1 m) 110 dB
Threshold of pain to the human ear 120-130 dB
Jet engine 140 dB
Peak of symphonic music 140 dB
Peak of rock music 150 dB
Blue whale 188 dB
http://www.enchantedlearning.com/subjects/whales/species/bluewhale/Loudest.shtml
The blue whale is much louder than a jet, which reaches only 140 decibels! Human shouting is 70 decibels; sounds over 120 decibels are painful to human ears. The second-loudest animal on Earth is the howler monkey (Alouatta) from the jungles of Central and South America.