The BIRDS is site specific audio-visual installation made by Bojana Atlija and Maja Ćurčić for the space of Street gallery in Belgrade in 2015.The composition consists of bird form sculptures and 3 channel sound installation. By putting the flock of birds in the center of the city,the intention was to reinterpret relation of natural and urban, and look for the possibilities for their mutual transformation. With this simulation the idea is also to examine, whether is possible to evoke the similar feelings experienced in nature, by using the sculpture and sound. Also, we wanted to draw attention to the lack of natural sounds in the city center, and the sound pollution which is underlinyned by parcial use of samples of the birds recorded on the territory of Belgrade municipalities with less traffic.