Armadillos provide some unique values for humans. For one, armadillos are often used in the study of leprosy, since they, along with mangabey monkeys, rabbits and mice (on their footpads), are among the few known non-human animal species that can contract the disease systemically. They are particularly susceptible due to their unusually low body temperature, which is hospitable to the leprosy bacterium. The nine-banded armadillo, Dasypus novemcinctus, also serves science through its unusual reproductive system, in which four identical quadruplets are born in each litter. Because they are always identical, the group of four young provides a good subject for scientific, behavioral, or medical tests that need consistent biological and genetic makeup in the test subjects.
Armadillos further add to the wonder of nature for humans, with their unique body armor and the propensity of some to roll themselves into a tight ball when threatened.
Armadillos also provide ecological values due to their role in food chains.
These values reflect the principle of dual purposes, whereby every entity not only advances its own individual purposes but also adds value to higher entities (ecosystem, humans).