it's rly useful to study analogous traits, as we can use them to test evolutionary theories to do with function. we can't do this with homologous structures, bc the change would have come from one common ancestor (and so would just be one data point, even if it affected millions of species)

the same gene exists in birds - it also plays a role in their vocal learning. rly interesting example of an analogous trait & def not something i expected !!