silver pheasant, phasianus nycth
鷳 refers specifically to the silver pheasant, a bird species (Phasianus nycthemerus). Its meaning is a single concrete animal, not a broad conceptual cluster.
鷳 combines 鳥 (bird) with 閒, which likely contributes the sound. The character was created to name the silver pheasant specifically.
The bird radical 鳥 on the right and the left component 閒 (which can suggest leisure or space) together picture a graceful, ornamental bird: the silver pheasant.
For カン, imagine a silver pheasant perched on a can: can -> カン, and the bird's metallic sheen matches the tin can.