Kangaroo training session at Rockhampton Zoo Our keepers do training sessions like this one several times a week with the roos. Not only is stretching up good for veterinary checks, because it shows the roo's chest and stomach area, but it also gives a more accurate result when weighing the roos. A lot of a kangaroo's weight is in its tail, and stretching up moves their weight over onto their feet, giving a more thorough result on the scales. Some of our mob prefer sweet potato chunks as treats,