Good point, but birds only have one mass extinction separating them from lizards, whereas mammals have two.
Also, cursory Google search suggests that the consensus opinion is that hair and feathers are an example of convergent evolution, although the timeline is so tight that they could have split off from each other when mammals and dinosaurs split off from the therapsids.
Good point, but birds only have one mass extinction separating them from lizards, whereas mammals have two.
Also, cursory Google search suggests that the consensus opinion is that hair and feathers are an example of convergent evolution, although the timeline is so tight that they could have split off from each other when mammals and dinosaurs split off from the therapsids.