Of the some 9,000 known species of birds, about 5,000 are classed as songbirds. Their songs break the silence of the deep forest.
هنالك نحو ٠٠٠‏,٩ نوع معروف من الطيور يُصنَّف حوالي ٠٠٠‏,٥ منها كطيور غرِّيدة .‏