We predicted that if great tit males express any degree of song repertoire plasticity, individuals receiving unfamiliar song will try to match the 'new' song by including new songs in their repertoire or recalling unsung songs from memory [18].
Furthermore, we found no correlation between the amount of singing and the degree of song imitation.
However, within any experimental or control group, there was no correlation between the amount of singing and the degree of song imitation (F-statistics all comparisons, p>0.4).
We also determined the degree of song orderliness using network analysis, where song sequences are translated into networks of song types as nodes with song transitions as connectors (following [ 47]).
While activity of RA-projecting LMAN neurons in juvenile birds shows no significant rendition-to-rendition correlation (Ölveczky et al., 2005), recordings from non-identified LMAN neurons in adult birds have shown a relatively high degree of song-locking (Kao et al., 2008).
Imprinting has been demonstrated in too many bird species to cite them all here, with varying degrees of importance put on song or anatomical features depending on each species.
All of the Eurovision entrants intend to make an impact through the power of song, with varying degrees of success.
The slight tension in Mr. Brown's differing degrees of response to the songs' lyrics becomes uncomfortably pronounced in the second section, a female quartet to "Love for Sale".
Scharff et al [45] induced death of HVC projection neurons in zebra finch, and observed variable degrees of recovery of the songs even though the incorporation rate of new neurons is increased.
The high degree of variability in songs sung by individuals coupled with the overlap in the usage of particular song types between individuals makes it unlikely that a single song feature can be used for distinguishing among individuals.
