I just read the book by Amanda Ebenhack, Redfoots & Yellowfoots and found it to be very informative with good pictures and a great list of references for more reading. The reason I ordered it is because I got a 5 year old cb Yellowfoot about a month ago and I haven't had a Yellowfoot for over 35 years, back then there was little or no info on them. I think it was 1972 that I gave my girl friend (we got married in1975) a Redfoot tortoise and she named him Schroder. Well with no real source to get information neither tortoise lived past 18 months, the Yellowfoot lived longer than the Redfoot (the biggest unknown factor was the danger of internal parasites) all we knew it was important to remove the ticks.It was all a learning experience back then just as it is today. We still have Schroder and the Yellowfoot.(pics included) This book was published last year so it has some of the most up to date information.