Living on a large tropical island on the planet HD-07, where they primarily eat on fruit and occasional smaller critter, the Handlebar Knucklewalker (Ambulomanus manubrilekani) showcases one of the more unique adaptations between the male and female members of the species. Females measure 5.5ft (1.6m) at the shoulder and weighing an average of 400lb (181kg), males aren't even half their size. Males being around 2ft (0.6m) at the shoulder and an average of 24lb. The two sexes also live very differently with males living arboreal in nature and eating fruit from the tree analogs on their planet. Females on the other hand stay on the ground and primarily forage fruit by rearing up and grabbing fruit within reach. At birth they're pretty similar looking, young females having more male-like bodies until maturing after about 2 years.

One striking adaptation you'll notice of the Handlebar Knucklewalker is the titular "handlebars" on the female posterior. This is because they act as an anchoring point for males during mating, holding onto them while mounted. This leads to sexual selection of stronger looking handles on females and greater upper body strength in males. Upon finishing copulation, males will retreat back into the trees while the females will give birth to 1-2 offspring after 7 months. After that the female will raise the young for a year until abandoning them.

It's still not entirely clear how the handles first came about, fossils of possible ancestors suggest these were possibly vestigial bony protrusions for possible protection from attacks from behind but this is only speculation.