These are not kangaroos in the strict sense but are in fact Black Footed Rock Wallabies (Petrogale laterals). Now, the difference between a kangaroo and a wallaby are basically down to size - wallabies are smaller - but also some specific details of their teeth.
The little animals are just over 1/2 a metre long, with a tail of a similar length. But what makes them remarkable to watch is the way the bounce around rocky slopes and cliff faces with the same confidence I walk along a pavement. They also move a hell of a lot quicker than I do on the flat!
These animals were chasing, fighting and generally eating a bit of grass on the rocky slopes at Simpsons Gap in the Northern Territory. They put on a good show for one and all.
So why "my world" - because, with very few natural exceptions, if you are looking at a wild animal that looks like this you can only be in one place in the world - Australia.
You can find more shots from around the world at Our World Tuesday.
Enjoy the pictures.