Final answer:
The butterfly is not a mammal; it is an invertebrate and an insect. Mammals are characterized by features like endothermy, hair, and milk production, which butterflies do not possess. Cows and goats, however, are typical examples of mammals.
Step-by-step explanation:
The animal among butterfly, cow, and goat that is not a mammal is the butterfly. Mammals possess certain characteristics such as being endothermic vertebrates, having four limbs, and typically giving birth to live young or laying amniotic eggs. They also have hair or fur and produce milk to feed their young. Examples of mammals include cows, goats, rabbits, mice, elephants, and many more.
Butterflies, on the other hand, are invertebrates and belong to a group known as insects. They go through a life cycle that includes stages such as egg, larva, pupa, and adult. Unlike mammals, they do not have a vertebral column (backbone), and they lay eggs from which caterpillars (larvae) emerge, rather than giving birth to live young.