I ran into 海鼠哉 on my own web page.
I know 海 and I know 哉 ( I have web pages up for both ) but whatever is 鼠 ?
Now I load a light-weight copy of kanjidic2 when a user asks for a definition because it takes no more time than any other alternative - and after it is loaded, it is FAST.
But ALAS ! 海鼠 is a compound kanji for namako !