domestic duck
鶩 centers on a domestic duck, a bird kept around the home or farm rather than a wild waterfowl.
鶩 combines 敄 (which may contribute a phonetic element) with 鳥 (bird), pointing to a type of bird, specifically a domestic duck.
The top part 敄 looks like a spear 矛 and an action hand 攵, while the bottom is a bird 鳥. Imagine a domestic duck being herded with a spear-like stick on a farm.
For ボク, picture a domestic duck waddling into a small box (ボク) in the farmyard: box -> ボク, and the duck goes inside.
bored by the familiar, intrigued by novelty; domestic chicken and wild duck