Ecologists have a hard time explaining what’s happening on land, and even more so, in the water, to folks who haven’t spent their life studying a single animal or habitat. Now we have the air. Increasingly, we are realizing the air above is partitioned off by species. Some fly higher at different times of the day or or year. Migrating birds might fly higher than usual. Dispersing birds might move fly higher on the way to their evening roost. Species might specialize on insects that fly lower or higher. Lower flying animals might be out-competing others that are forced to flyer higher. Many factors make this space complex, and we are just starting to understand it.