cockatoo
鵡 refers specifically to a cockatoo, a type of crested parrot. The meaning is narrow and concrete, with no broader conceptual center beyond this bird.
鵡 is a phono-semantic compound: 鳥 (bird) provides the meaning, and 武 likely contributes the sound. The character was created to name the cockatoo, combining the bird radical with a phonetic element.
A bird (鳥) with a martial (武) crest: imagine a cockatoo with a striking, warrior-like crest of feathers.
For ブ, picture a cockatoo booing loudly from its perch: boo -> ブ, and the bird's call echoes its reading.
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chambered nautilus (esp. species Nautilus pompilius)
(large) parrot (incl. the cockatoo)
grey parrot (Psittacus erithacus); African grey parrot
kakapo (Strigops habroptila); owl parrot
palm cockatoo (Probosciger aterrimus); goliath cockatoo; great black cockatoo
parakeet auklet (Aethia psittacula)
kea (Nestor notabilis)