Here's why:
* All tigers are mammals: This means they share certain characteristics with other mammals, like having fur, giving birth to live young, nursing their offspring with milk, and being warm-blooded.
* White tigers are not a new species: They have the same biological makeup as other Bengal tigers. The white color is due to a rare recessive gene that affects their pigmentation.
So, a white tiger is a mammal because it belongs to the species of Bengal tiger, which are classified as mammals.