- Sonogram 1 is more stable compared to sonogram 2 in terms of stability of frequency. In the middle, there is a large fluctuation of frequency in sonogram 2 for a long duration. On the other hand, there is a short period of fluctuation in sonogram 1 towards the end.
- The pitch fluctuates much less in sonogram 3, compared to sonograms 1 and 2. However, the lines are very thick, indicating that the pitch may be louder to because the white-bird sparrow cannot hear any other bird song.
- The song is both innate and learned because all populations of white-bird sparrow shared a similar pattern, but there were individual parts that differed, specifically in sonogram 3 when the environment changed.
- Sonogram V seems to have some similarity to sonograms 1, 2 and 3 at the beginning. However, the pitch becomes similar to that of sonogram 4 towards the end as seen in the downward sloping pitch. The major difference is that sonogram V has a higher fluctuation than sonogram 4.
- As mentioned above, the beginning part of sonogram V is similar to that of sonogram 1 and 2, in that there is a thick line.
- Birds rarely imitate other species because actions of other species may attract danger that they cannot deal with or may distract mates from them. s
- Morton and Bapsta’s observations are evidence of learned development of birdsong, as the specie was able to overcome its innate behavior and acquire a new behavior.