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The chaffinch studied in classic song-learning experiments is Fringilla coelebs, a songbird. Its male song combines inherited organization with details acquired through learning.

In his 1958 experiments, W. H. Thorpe compared wild birds, juveniles isolated after time in the wild, and birds hand-reared in auditory isolation from the fifth day of life. The early-isolated birds produced much simpler songs; birds isolated only in their first autumn retained nearly normal patterns. Groups of early-isolated birds could develop elaborate but abnormal shared songs by hearing and copying one another.^[ref]

A playback apparatus called the Song Tutor presented artificial patterns assembled from chaffinch notes. Birds learned some patterns when their tonal qualities were sufficiently similar to normal song. These results distinguish inherited dispositions from the auditory experience needed for local song details. Learning was also concentrated in a sensitive period, principally within the first thirteen months in these experiments.^[ref]

A songbird, or oscine, is a bird of Passeri, a major branch of Passeriformes. The name denotes evolutionary membership, rather than a judgment about whether a particular call is melodious. The chaffinch is one familiar example. Relationships among these birds are studied using DNA and phylogenetic trees, alongside their anatomy and behavior.^[ref]

Songbirds provide particularly clear experiments on learning. In W. H. Thorpe's chaffinch experiments, birds raised without normal song exposure developed simpler songs, whereas birds with early experience could retain much more normal patterns. An apparatus called the Song Tutor replayed constructed sequences of notes, letting the investigator change what a juvenile heard rather than merely observe wild adults. Some artificial patterns were learned, provided their sound characteristics were sufficiently appropriate.^[ref]

The comparison separates three questions: what vocal patterns a bird can physically produce, what experience supplies, and when that experience is effective. A sensitive period means that the timing of exposure matters. These results establish a role for experience in the tested species; they do not imply that every songbird learns the same repertoire at the same age.

W. H. Thorpe studied how birds acquire song. His experiments on hand-reared chaffinches varied their auditory experience and compared later songs, including exposure to artificial tutoring patterns. The design distinguished what develops without normal song exposure from what is shaped by hearing an appropriate model.^[ref]

The illuminating point is that an orderly adult behavior need not be either wholly learned or wholly independent of experience. Controlled exposure can reveal constraints on learning while also showing that the final pattern depends on the sounds encountered.