species of mynah
鸜 refers to a specific kind of bird: a species of mynah. Its meaning is narrow and ornithological, with no broader conceptual center beyond that bird.
鸜 combines 瞿 (likely a phonetic component) with 鳥 (bird), forming a character for a specific bird species. The exact historical development is uncertain.
The left side 瞿 looks like two eyes peering, and the right side 鳥 is a bird. Picture a mynah bird staring back with its distinctive eye markings.
For ク, imagine the mynah bird making a cooing sound: coo -> ク, and the bird calls out from its perch.