A pink fairy armadillo may live by an anthill for "fast food" This is a parasitic relationship because pink fairy armadillo benefits while the ants are harmed (eaten).
An armadillo rooting at the base of a tree is commensalism. The armadillo benefits by getting food, while the tree is not harmed.
A Pink fairy armadillo and soil have a mutualism relationship. A pink fairy armadillo benefits because it gets to poop, while the soil gets fertilized.
An armadillo can have many different types if fungi, some of which can cause human diseases. This is relationship is parasitism. Humans can get these diseases from the armadillos, they are the ones being harmed.
An armadillo and snakes have a commensalism relationship. Abandoned armadillo holes are a great den for snakes, while no harm is done for the armadillo that has moved on.
An armadillo and fer-de-lance snake share a mutualistic relationship. The fer-de-lance snake guards the armadillo hole, the armadillo's feces help manufacture the snakes poison. Both species benefit from this relationship.
Pink fairy Armadillos and worms have a predator-prey relationship. The pink fairy Armadillo is the predator, while the worm is the prey and gets eaten.