SY MONTGOMERY and RICHARD ESTES signing and discussing THE MAGNIFICENT MIGRATION: ON SAFARI WITH AFRICA’S LAST GREAT HERDS . Sy’s thrilling book for middle school readers and above recounts a recent safari during which she accompanied Richard Estes, the world’s foremost wildebeest (or gnu) authority, on a journey through the Serengeti as they followed the massive annual migration of gnus. Sy lives in Hancock, Dr. Estes in Peterborough. Also along for the trip was author and naturalist Elizabeth Marshall Thomas of Peterborough. The remarkable photos of father and son Roger and Logan Wood, summer home friends of the Estes, taken during the trip fill the pages of the book.