Sound Quiz Answer!

For those he also thought it was a feline, I'm sorry to say it wasn't...
Check out this video (minute 1:03)

To my surprise I found out some time ago,
that some snakes (King Cobra and Rat snakes) are able to growl when threatened.

Generally a typical snake hiss has a broad-frequency span (~3,000 to 13,000 Hz) with a dominant frequency near 7,500 Hz, whereas the "growl" of the king cobra consists of frequencies below 2,500 Hz, with a dominant frequency near 600 Hz.)

Well, it will be next time!
Stay tuned for more interesting stuff.

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Thanks to all and Aaron for participating!