Great explanation, one thing missing is extinction events. Small extinction events in a matter of decades (for birds) drastically influence characteristics tha

Great explanation, one thing missing is extinction events. Small extinction events in a matter of decades (for birds) drastically influence characteristics that are favored or disfavored - like a drought, or too much rain, or invasion by another species or whatever. Apparently[1] the characteristics that help animals eat in threatening times are the ones that drive evolution. [1] The Beak of Finch book