A Flower Shaped Around the Hummingbird
Almost everything about the flower points to bird pollination. It is red — a colour birds notice and many insects largely overlook. It nods downward, suiting a visitor that hovers rather than lands. And its nectar is held at the tips of five long spurs, out of reach of most short-tongued insects. The ruby-throated hummingbird, returning north as columbine blooms, can hover beneath a flower and reach the spurs with its long bill and tongue, pollinating as it feeds.
It is not the only visitor that can manage the spurs — long-tongued bees and hawk moths reach the nectar too. And some take a shortcut: short-tongued bumblebees occasionally bite a hole near the spur tip and drink directly, "robbing" the flower of nectar without pollinating it.