Most flowering plants are more than willing to spread their pollen around. But some flowers hold out for just the right partner. Bumblebees and other buzz pollinators know just how to handle these stubborn flowers. They vibrate the blooms, shaking them until they give up the nutritious pollen.
This male Mountain Bluebird working hard scouting for a nest location, because female chooses her mate not by his looks but solely on how good the nesting cavity is. These guys found perfect nesting spot here. Bluebirds are monogamous birds, they mate for life.