silver pheasant badge worn by civil officials of the 5th grade
鷴 refers specifically to a silver pheasant badge worn by civil officials of the 5th grade in historical Chinese/Japanese court systems. The meaning is narrow and cultural, not a general bird or animal term.
鷴 combines 閑 (leisure, barrier) and 鳥 (bird). The character was created to name a specific bird used in official insignia, likely chosen for its phonetic and semantic associations.
The left side 閑 suggests a barrier or gate, and the right side 鳥 is a bird. Imagine a silver pheasant perched on a gate, marking the rank of a 5th-grade official.
For カン, picture a silver pheasant badge pinned on a can of official documents: can -> カン, and the badge marks the 5th-grade rank.
silver pheasant (Lophura nycthemera)