The audio titled "Whistling of Birds" is a serene and soothing arrangement of nature's music. It starts with a soft, yet distinct whistle of a bird, piercing the calmness of a peaceful morning. The whistle, a unique and captivating sound, is a delightful melody that seems to echo in a tranquil forest. As the audio progresses, the solitary whistle gradually evolves into a symphony of various bird calls, creating an immersive soundscape of layered bird effects. The tweeting, chirping and whistling are harmoniously intertwined, reflecting the rich diversity of avian species. The audio ends on a calming note, leaving the listener with a sense of tranquility and a deeper appreciation for the beauty of nature's sounds.