Female and male Red Kangaroos have slightly different appearances. Males are larger and are commonly more red in colour, and have an external scrotum. Females, however, are smaller and often more grey/blue in colour. Female Red Kangaroos are often referred to as 'blue flyers'. Females of this species also have a pouch.
Again differing, females become sexually mature at a younger age - at 1.5-2 years compared the 3 years of males. Red Kangaroos breed continuously throughout the year.
The males compete for females and are only of competitve size at 7 years and at their prime at 10 years. They can support their entire body weight on their tail when in combat.
Females are capable of embryonic diapause, and can produce two types of milk simultaneously for young at different stages of development.
The gestation period for Red Kangaroos is 31-36 days. Immediately after birth, when the joey is hairless and the size of a jellybean, it climbs into the pouch. For 4-4.5 months, the young is constantly attached to the nipple, where it first emerges after 6 months.
The joey is weaned at 12 months.