Geographic Isolation plays a major role in the evolution of Struthioniformes. The individuals are spread all over the world without ways to migrate to each other. It is believed that they once had a common ancestor but when Pangea happened, the organisms were geographically isolated, and they then were forced to adapt and evolve with their new habitats. Natural Selection played a major role in this.
Microevolution effected some of the organisms in the order Struthioniformes as well. For example, the kiwi, in order to adapt to it's habitat in New Zealand, quickly shrunk in size and grew a longer beak. The genetic probability of different traits quickly changed when the habitats changed. On the southern side of the map, the Ostrich experienced microevolution as well in Africa, as it grew long strong legs to be able to outrun many of its predators.
Microevolution effected some of the organisms in the order Struthioniformes as well. For example, the kiwi, in order to adapt to it's habitat in New Zealand, quickly shrunk in size and grew a longer beak. The genetic probability of different traits quickly changed when the habitats changed. On the southern side of the map, the Ostrich experienced microevolution as well in Africa, as it grew long strong legs to be able to outrun many of its predators.