Riley, a tiny four-month-old wallaby, is being hand-reared in a rucksack after his mother died of pneumonia. / VCG Photo

This orphaned baby now is being nurtured by wildlife carer Julia Stewart, who has to carry Riley around in a furry rucksack from 6:30 a.m. to 10:30 p.m. every day and feed it every four hours. / VCG Photo

Julia puts the baby wallaby in the passenger seat when she drives. / VCG Photo

Riley is allowed out of the pouch for an hour and a half a day to hop around with other wallabies at Studley Grange Butterfly World and Farm Park near Swindon, UK. / VCG Photo