Pig
The pig, also known as swine or boar, is a highly adaptable and intelligent animal present all across the Fifth World. Some descend at least partly from formerly domesticated pigs gone feral after collapse, but many descend primarily from wild pigs. Feral pigs possess incredible intelligence, enormous size, and terrible strength.
#Human relations
People of the Fifth World frequently hunt pigs. They eat the pigs' meat, make clothing from their hides, make brushes from their hair, and make jewelry and other decorations from their tusks.
#Specialization
A community specializing in relationship with pigs most likely lives as hunter-gatherers, roaming the forests and hunting wild pigs as one of several game animals they hunt. Due to pigs' ferocity, hunting them takes great skill, ingenuity, and courage. Hunters of wild pigs take their lives into their hands. As a result, such a community would likely honor feats of bravery. Perhaps they use a young hunter's first pig hunt as a coming-of-age ritual, painting the initiate in the stripes of a piglet until hen has successfully taken down a pig, at which point they ritually wash the stripes off. Perhaps they have legends about enormous, monstrous boar and the heroes who finally took them down. Regardless, they certainly respect the pigs' strength, cunning, and tenacity, and make sure never to take more pigs than the Keeper of the Game has told their wizard they may take.
A community specializing in relationship with pigs will likely hunt with spears, or bows and arrows, to maintain distance from the dangerous animal. They may have become proficient at tree-climbing, shooting pigs on the ground from tree branches up above. Such hunting holds less honor, but has the advantage of pork with far less risk. This sort of community likely climbs trees for many purposes. They might also have a relationship with coconuts, or fellow climbers monkeys. They may even live in tree houses, with rope-bridges woven from living vines!
A community specializing in relationship with pigs may also forge an alliance with a local coydog pack, hunting pigs together and splitting the meat between them. This alliance would help spread out the risk and make the hunt more effective. However, it takes sensitive negotiation, likely by the community's wizard, as the coydogs may still remember how humans once used their domesticated ancestors for hunting -- as servants, not as equals. Once established, though, this bond can hearken back to the friendship both species' ancestors shared long before civilization.