the mango-bird, the Chinese oriole
鸎 refers specifically to a type of bird: the mango-bird or Chinese oriole. The meaning is narrow and ornithological, without broader abstract extensions.
鸎 combines 賏 (likely a phonetic component) with 鳥 (bird), forming a character for a specific bird species. The exact historical development is uncertain.
The top 賏 looks like a pair of shells (貝) under a roof, and the bottom is 鳥 (bird). Imagine a distinctive bird with shell-like markings on its wings: the mango-bird or Chinese oriole.
For ヨウ, picture a yellow oriole singing 'yo-u' (ヨウ) from a branch. The bird's call sounds like ヨウ, helping you remember the reading.
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