Conversation so far:
What are mammals?
Mammals are vertebrate animals constituting the class Mammalia, and characterized by the presence of mammary glands which in females produce milk for feeding their young, a neocortex, fur or hair, and three middle ear bones.
What are mammals' key characteristics?
On the following slides, you'll learn about the eight main mammal characteristics, ranging from hair to four-chambered hearts.Hair and Fur. ...Mammary Glands. ...Single-Boned Lower Jaws. ...One-Time Tooth Replacement. ...Three Bones in the Middle Ear. ...Warm-Blooded Metabolisms. ...Diaphragms. ...Four-Chambered Hearts.
How many legs do mammals have?
Not only do mammals have four legs but actually all terrestrial vertebrates (which include mammals) have four legs. There are slight exceptions though as some lineages have lost their legs.

Question: What is the largest one on land
Self-contained rewrite: What is the largest mammal on land?