long-tailed bird, dove, bullfinch
鷽 centers on a specific kind of bird: a long-tailed bird, dove, or bullfinch. The meanings are all bird types, with no single abstract concept connecting them beyond being a bird.
鷽 combines 鳥 (bird) with a phonetic component that includes 臼 and 爻, suggesting a bird whose name sounded similar to that phonetic. The exact historical development is uncertain.
The bottom is 鳥 (bird), and the top looks like a nest with twigs (臼 and 爻). Picture a long-tailed bird or dove sitting in a twiggy nest.
For カク, imagine a bird with a long tail that makes a 'caw-caw' sound: caw-caw -> カク, and the bird is a bullfinch or dove.