The section on birds seems a bit out-of-place as a "real life" example, because birds do not follow the XY sex determination system and as such comparing them to "males" and "females" of other species (in particular humans) is very dubious/questionable.
The section on birds seems a bit out-of-place as a "real life" example, because birds do not follow the XY sex determination system and as such comparing them to "males" and "females" of other species (in particular humans) is very dubious/questionable.