kind of bird of prey, hawk
鸇 centers on a specific kind of bird of prey, typically a hawk or similar raptor.
鸇 combines 亶 (likely a phonetic component) with 鳥 (bird), indicating a type of bird. The exact historical development is uncertain.
The right side is 鳥 (bird), and the left side 亶 looks like a complex structure. Imagine a hawk perched on a tall, intricate stand (亶) used for falconry.
For セン, picture a hawk swooping down to snatch a cent (coin) from the ground: cent -> セン, and the hawk is a bird of prey.