Yes, a gray wolf is indeed a mammal. Mammals are a class of animals that are characterized by certain features, including having fur or hair on their bodies and the ability to nurse their young with milk produced by mammary glands. Gray wolves, which belong to the species Canis lupus, exhibit both of these traits. They have a thick coat of fur that helps them adapt to various climates, and female gray wolves give birth to pups that they care for and feed with milk.
Additionally, being part of the mammal group, gray wolves possess other common characteristics of mammals, such as being warm-blooded and having a complex brain structure. This allows them to exhibit social behaviors and a range of vocalizations, further highlighting their status as mammals.