What did the genomic data suggest about the role of olfaction in the Zebra Finch compared to previous assumptions for songbirds?

Evidence for numerous functional genes associated with olfactory receptors, previously thought to be pseudogenes or absent.

The sequencing of the Zebra Finch genome provided a molecular blueprint that challenged long-held assumptions regarding avian senses, particularly olfaction. For many years, the sense of smell in songbirds was considered minimal compared to mammals. However, the genomic analysis revealed the presence of numerous genes associated with olfactory receptors. The significance of this finding lies in the fact that these genes were often assumed to be non-functional remnants (pseudogenes) or simply missing from the avian genetic code. This suggests that olfaction might play a much more substantial, though perhaps subtle, role in the finch's life, possibly affecting crucial activities like communication, predator avoidance, or mate selection.