Final answer:
The sentence correctly rearranged is 'Dainty wings and low chirrup thrill ornithologists', indicating the fascination ornithologists have with the subtle aspects of birds.
Step-by-step explanation:
The correct rearrangement of the given sentence is: Dainty wings and low chirrup thrill ornithologists. This sentence suggests that the delicate nature of the bird's wings and the soft chirping sounds they make are fascinating to those who study birds, known as ornithologists. It indicates an appreciation for the fine details and behaviors of avian species, highlighting the joy and interest that birds can bring to bird watchers and professionals alike.