A hummingbird's nest is composed from a variety of materials, and plants play an important role. Small pieces of soft plant fibers and bits of leaves create its flexible shape that expands as the nestlings grow. Fluffy plant down and animal hair line the inside. And bits of lichen and moss cleverly camouflage the outside. Make your yard a haven for nesting hummers by adding plants like lambs' ear (shown here), and get more tips at Birds & Blooms.