Hummingbirds and flowers are quick, redwood trees are slow, and whole redwood forests are even slower.
Most interaction is within the same pace level - hummingbirds and flowers pay attention to each other, oblivious to redwoods, who are oblivious to them.
A Hierarchical Concept of Ecosystems (1986).
Robert V. O'Neill, Donald Lee Deangelis, J. B. Waide & Timothy F. H. Allen
