"The Red Kangaroo (Osphranter rufus) is the largest of all kangaroos, the largest terrestrial mammal native to Australia, and the largest extant marsupial".
So says Wikipedia, and who am I to argue.
These Kangaroos were photographed in the Wyperfeld National Park - which is in the NW of Victoria. This part of the state is badged as Victoria's Outback - and it does have the feel of a more remote and dry part of the world.
The redder of these 'roos is the male and the one with the greyer chest is the female. The females can look very blue/grey at times and are often called "Blue Fliers". Males are called Big Reds!
The males are an impressive beast to say the least - Males can have a head-and-body length of 1.3–1.6 m (4.3–5.2 ft) and the tail adds up to 1.2 m (3.9 ft) to the total length.