Sure, it may seem like evolution made the male kangaroo ridiculously—even grotesquely—muscular. But you have to do something to impress the ladies if you're going to keep them pregnant all the time, and they just don't fall for kangaroo poetry any more.
A dying female kangaroo is cradled by her mate in River Heads, Queensland. The joey stared at his mother and touched her softly, before standing protectively near her body. “I saw the male pick up the female, he looked like he was just trying to get her up and see what was wrong with her,” Switzer said. “He would lift her up and she wouldn’t stand she’d just fall to the ground, he’d nudge her, stand besides her … it was a pretty special thing, he was just mourning the loss of his mate."
Larger male red kangaroos are powerfully built. Like many species, male kangaroos sometimes fight over potential mates. They often lean back on their sturdy tail and "box" each other with their strong hind legs.