owl-like bird, buzzard
鵩 centers on a specific kind of bird of prey: an owl-like bird or buzzard. The meanings point to a single creature type rather than a broad abstract concept.
鵩 combines 服 (likely for sound) with 鳥 (bird), forming a phono-semantic compound for a type of bird. The exact historical development is uncertain.
The left side 服 (clothing) and right side 鳥 (bird) together suggest a bird dressed in a certain way—imagine an owl-like bird with feather patterns that look like formal clothing, making it a buzzard.
For フク, picture a bird wearing a fuku (服, clothing) that makes it look like a buzzard: fuku -> フク, and the bird's outfit helps you remember the reading.