The female alone builds the nest, incubates the eggs, and cares for the young. It makes a small conical cup nest of plant down without the attached lichens of many other hummingbird nests.
This passage describes the unique nesting behavior of a specific hummingbird species. It highlights the female's role in all aspects of nest construction, egg incubation, and chick care.  The description emphasizes the distinctive features of this particular nest.