Bennet's wallaby, aka red-necked wallaby

You're welcome William. Marsupials are fascinating. A female wallaby can have one fetus gestating in her womb, another latched on to a teat in the pouch, and a third still nursing. If she is stressed, she can jettison the pouch young and stop the in-utero one developing further. And then start up the fetal development again when the time is right. A placental female has lots fewer options.

Females weigh about 11 kilos (24.2 pounds), males can weigh over 20 kilos. Young stay in the pouch for nine months, and are weaned at about seventeen months. Marsupials are born very vestigial, and tiny, with no discernible rear limbs. They use their fore-limbs to climb from the vaginal opening up to and into the pouch where they latch on to a nipple (their mouths actually fuse to the nipple). They start leaving the pouch at around six months. I'm not sure how heavy they are when they finally leave the pouch, but I'd guess they're around 3 kilos (but very leggy).

I found another photo, Gina. That's the joey's tail sticking out over its shoulder.

I love the pouch young at this size because they get out and hop around on their own, and then throw themselves back in the pouch whenever they need a rest, or to nurse, often with the tail and a hind leg still sticking out.