The preamble doesn't say it has to sound like moan. On the basis that a moa was a bird...giving bird + n... for moan, I felt that crow(n) was OK for 102 down, just as ree(n) was for 84 down, both being birds followed by n, as you suggest, Endanger.
To be honest, I think the setter completely overdid things in his search for complexity in this crossword. For example, I wonder what percentage of the population of Britain pronounce the name, Maude, to rhyme with the word moored. Only those with a somewhat drawled variety of Oxford/BBC/RP mode of speech, I suspect. Certainly I didn't see it until someone pointed it out here on AnswerBank.
But what the hey! It's just a crossword.