Pink noise or 1/ƒ noise (sometimes also called flicker noise) is a signal or process with a frequency spectrum such that the power spectral density (energy or power per Hz) is inversely proportional to the frequency: en.wikipedia.org/wiki/Pink_noise. UCS Category: TEST. Duration: 00:19.
Two Tawny Owls or Brown Owls (Strix aluco) that answer each other. A male who hoots and a female who screams. To learn more, go to Wiki: en.wikipedia.org/wiki/Tawny_owl. UCS Category: BIRDPrey. Duration: 00:28.
Noise corn popcorn bursting in a pan on a hot plate. Means the wriggling little oil and corn which explodes and tape against the cover. UCS Category: FOODCook. Duration: 00:57.