Abstract
There has been interest in identification and characterization of bird calls from different point of views including breading of birds. We studied sound produced by different birds like small green barbet, Jordon's chloropsis, necklaces laughing thrush etc. to characterize the bird calls using the prominent frequencies that are produced. The bird calls are qualitatively different for different birds and can clearly be identified in most of the cases. Comparison of sound produced by selected birds is implemented using the frequency distribution of sound. The frequency spectrum of sound is obtained using Fourier Transform technique implementing Fast Fourier Transform (FFT) employing standard mathematical software Mathcad. Findings and details are presented, the noise power levels are also presented for a typical case.