% directory where the WAV-files of the birds are stored:
dpath = fullfile(mildatapath,'birds');

fname = 'PC13_20090531_050000_0.wav';
%fname = 'PC8_20090531_050000_99.wav';
[signal,fs] = wavread(fullfile(dpath,'wavs',fname));

[S,f,t] = spectrogram(signal,512,256,[],fs);

figure(2); clf; showspec(S,f,t);

figure(3); clf; showspec(imag(S), f,t);