Using my vast knowledge I've gained on Kangaroo's having spent the last few years living in a suffolk coastal town, (or I may just be guessing!) I can imagine it working with young kangaroos who are still used to getting in to mother's pouch, or perhaps a hand-reared one?
I had also guessed at the mother's pouch answer but could not be sure. I was curious as to what others might think.
lets see him try that with a big one