same as for why the peregrine falcon is so-named. And perhaps also Peregrin Took, although I wouldn't like to swear on that one!!
I've enjoyed this very bizarre and random thread on zoos, music and everything else in between. To see a Lord of the Rings comment intertwined with a discussion about zoos was amusing, and what made me smile even wider was the word "peregrinations". I just finished re-reading Gerald Durrell's "The Whispering Land" and he uses that exact word in the final chapter of the book. Splendid!