The book wherein I read the report of 500 being trapped on SRS is Coyotes Settle the South by John Lane. The biologist interviewed by the author is John Kilgo, son of the late author, James Kilgo. It doesn't give the time frame but the book was published in 2016 by the UGA press. Professional trappers removed 150 to 175 coyotes per year for 3 years on three sectors of the SRS which was 4-5 yotes per square mile per year for three years. According to Kilgo, it didn't make a difference. Gil