Answer;
-Macro evolution
Over millions of years, birds developed as a species. This relates to macro evolution.
Explanation;
-Macroevolution refers to evolution of groups larger than an individual species. Macroevolution encompasses the grandest trends and transformations in evolution, such as the origin of mammals and the radiation of flowering plants.
-The basic evolutionary mechanisms include; mutation, migration, genetic drift, and natural selection; and can produce major evolutionary change if given enough time.