I was just watching Animal Planet and I saw the biggest Yellowfoot that I've ever seen before. I didn't realize that they got that big. This tortoise must have been 18 to 20 inches long and his weight must have been somewhere around 30 lbs or more and I was surprise at how high the shell looked to be. This man was in South America looking for Anaconda and he came across a Yellowfoot in a river that feeds into the Amazon. My husband thought he might just be in Paraguay or very near there. I just caught a small part of him and the Yellowfoot. When I looked up at the T.V. he was in the water with a Yellowfoot that was underneath the water and it looked just like it was swimming. He never explained if it was swimming or whether or not it accidentally fell in the water. I've heard from some of you on here where they might swim I wish he would have had more information on what this Yellowfoot was doing in the water, but he didn't. Does anyone have any information about them being able to swim under water and how big do they really end up being in their native country?