Origin: NL, fr. Icel. Sla the gannet. See Solan goose.
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One more hint: These birds were considered fools. You told us too much. :) Quick google search and voila! Sula nebouxii is the name of the bird. :D Though I must say I though of that bird when you said fools though I didnt know that was their name. :) http://en.wikipedia.org/wiki/Blue-footed_Booby
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