One of the most frequent requests we have had for Chirp! is for us to add more birds. This presents a slight dilemma as the original idea behind the app was to help people learn the songs of birds that they might hear from day to day. Beyond about 25 birds this aim is a bit lost. On the other hand, if most customers would like a longer list, who are we to argue!
I do draw the line at including the near-silent Stork however (requested by one reviewer) ;).