The Window of Swallows in Rio de Janiero, Brazil

I visited Brazil and stayed in a simple guest house in the small mountain village in the region of Rio de Janeiro called The Window of Swallows. One of the bold rock mountains had a unique cave in the side, too high up and too shallow for man to explore, but a perfect place for critters to shelter. Thousands, upon thousands of sparrows are known to fly to this cave every night and take shelter, only to fly away again at the first ray of sunlight.