after others have seen how successful such sites can be. Better to just put on one of the following for background noise (or therapeutic use.) 
Furry Friend - Frequency-Shaped Cat Purr Noise Generator
Jungle Life - Frequency-Shaped Jungle Noise Generator
Rainforest - Interactive Tropical Forest Soundscape
Summer Night - Near ultra-sonic Natural Frequency Sound Generator
A Bird's Paradise - Interactive Tropical Birds Soundscape
Fairy Pond - Pond Soundscape Generator (Boat, Water and Frogs)
What the... Farm - Noise Blocker for Open-Plan Offices
Grazeland - Home of the Ruminants (and more!)
Nocturnal Garden - Interactive Soundscape Generator
Skywalker - The Sound of Paragliding
(my personal setting, not the default)
Sled Dogs - Dog Powered Online Noise Generator
Subaquatic Dreams - Underwater Soundscape Generator (Dolphin, Bubbles and Waves)
Underwater - Home of the Fin Whale
I picked all of the animal noises I could find, but there may be others. Have a look around 
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