To answer this question we need to look at each character in the dichotomic guide
so we start with section 1, which has a backbone, therefore we go to section 3. Section 3 does not have gills and scales so we go to section 4, there we have that lays eggs, we go to section 5. In section 5 we have does not have feathers, so we have arrived at the species Turdus migratorius.