The spikebacked tunki replaced its ancestor, the tunki. It became smaller to move faster, but because of this, it had become harder to stay warm, having lost most of their blubber. The reason why they replaced the tunki in the boreal, is due to their excessive ability to out compete the slow behemoths. There they ate a few scavengundi that they found, with their bodies adjusting to the little creatures. Their claws became hooklike, so that when they dug into nests, their claws hooked scavengundi on them. This started a process of dig a little, eat a little, dig a little, and so on. Shortly after, its skin changed on its back, hardening, and then sticking up into the air slightly. The blood in their backs became warmed by the sunlight, which then helped to heat their bodies. The proto-spikes became black to heat up even more, thus the spikebacked tunki were able to survive the nights and winter in the boreal. They retained from their ancestor the movement in packs, but the pack numbers changed to 24 to 30 in a pack. The males ceased to fight, only displaying their proto-spikes as the contest for mates, where they scratch them together, giving off a potentially threatening noise similar to a rattlesnake's rattling, an action usually reserved for scaring off possible predators. The spikebacked tunki with the best proto-spikes was the one that got to mate with the most females. The 'butt-nostril' was protected by a few proto-spikes, with the rest of the butt-nostril not having proto-spikes.. Their eyes were larger to help spot the small scavengundi creatures. They run on their toes, and they always run. This put more pressure then usual at the ends, which caused them to become creased like when a person creases shoes.