Spectrogram Analysis I have four .wav files and each contain bird chirps.  Given an input .wav file, I need to find out which bird it is.

I have some basic understanding of signal processing. I have used spectrogram to analyze my audio files and now I don't know how to make the frequency spectrum comparison to find out the solution.

Can someone please let me know the process with which I could find out the frequency of sound, bird chirps in my case, programmatically from the spectrogram? I am just a beginner, so I apologize if I said something which wasn't clear
Please check this answer, which describes a few approaches to the same problem. Given that bird song is a monophonic signal (only one fundamental frequency at any point in time - as opposed to polyphonic) - and given that the timbre is irrelevant, the most interesting feature to extract for this classification task is a pitch contour.