The young are born in an embryonic state, and female roos can actually halt the growth of an embryo during drought conditions. Kangaroos live in all states and territories, but you might spend a year in Australia and never see any at all. They don't come into the cities and are seldom seen in towns. Outside wild-life parks, the best place to see them is out in the bush, on farms after sunset or, unfortunately, hopping across the road outside the towns. Most Australians regard 'roos with some affection, but farmers in areas prone to drought usually consider them pests.
Kangaroo meat is low in fat, and kangaroo patties or kangaroo tail soup are well-known country food.
We generally refer to them as roos, kangaroos, or wallabies. The males are bucks, Old Men or boomers, the females does and the young, joeys. Pet kangaroos may become quite friendly, and there are tame ones in many wild-life parks. Kangaroos are quite well-known in fiction and folklore. They are reasonably big, but an adult could easily hold one in both arms - if the koala happened to be tame.