You've heard the saying "busy as a bee," but why not "busy as a wasp?"
This female mud dauber wasp is hard to photograph because she is moving so fast. (You can tell it is a mud dauber wasp by her ultra-thin, thread-like "waist.")
She is searching a sunflower plant for spiders or insects (depending on what species of wasp she is). She systematically looks over the plant, and then flies to another. Up and down, searching, searching, twitching sideways, and flicking her wings as she goes.
She isn't looking for food for herself, but for her offspring. Somewhere nearby she has a small nest made out of mud where she will hide some prey when she finds it. Then she'll lay her egg on the living food and seal up the mud chamber. The egg will hatch and the resulting larva will eat the food its mother left for it. When the larva reaches full size it spins a silk cocoon within the mud nest before forming a pupa. Eventually it will become an adult wasp and chew its way outside.
Mud dauber wasps are solitary wasps, which means that each female wasp makes her own nest and provisions it herself. Mud daubers do not work together like some of the social wasps do, for example the yellow jackets or white-faced hornets. Being solitary, like solitary bees, means these wasps are not very defensive.
Have you ever spotted a busy wasp like this one?
Ever found a glob of mud stuck under the eaves or against the window sill of your home? This black and yellow beauty is an example of the type of wasp that probably put it there. This is a mud dauber wasp (Sceliphron).
Notice her impossibly thin "waist."
Any idea what she is doing on this flower? No, she is not looking for nectar. Depending on the species, she was actually searching for caterpillars or grasshoppers, which she feeds to her young.
The adult wasp catches and stings the insects she uses as food. Then she carries them to her mud nest, where she stuffs them inside a mud tube she has created. She lays an egg on the processed prey. Then she carefully covers up the open end with more mud. Her offspring hatch from the egg inside the tube, and consume the insect or insects she has provided for them. After the larvae finish development and become adult wasps, they chew their way out and to fly off to make more mud nests.
Whenever I see a mud dauber wasp, I always think of the poignant poem called "The Digger Wasp" in Joyful Noise: Poems for Two Voices by Paul Fleischman, Eric Beddows (Illustrator). This wonderful set of poems about insects is written to be read by two people, although with practice one person easily manage it. Even the most apathetic, disinterested poetry non-fan will love these poems, because they are more like songs without music. In the poem I am referring to, the digger wasp mother provisions a nest for children she will never meet. Really makes you appreciate the hard work they are doing. That's why I never destroy a mud dauber nest unless I know for certain it is empty.