Pages in this category should be moved to subcategories where applicable. This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, pages and should mainly contain subcategories.
For relevancy, birds of a higher or lower scale of presence (e.g. 1. pan-American or also found on other continents - 2. birds present at local regional level) are included in parent or sub-categories respectively (e.g. "birds of the Americas" or "birds of the Amazon Basin" etc.).