Sentence:  We found on St. Paul's only two kinds of birds—the <WSD>booby</WSD> and the noddy. The former is a species of gannet, and the latter a tern. Both are of a tame and stupid disposition, and are so unaccustomed to visitors, that I could have killed any number of them with my geological hammer. 
Meaning of the word marked with <WSD> tags:  Any of various large tropical seabirds from the genera "Sula" and "Papasula" in the gannet family Sulidae, traditionally considered to be stupid.