Their arms, legs, tails,wings or fins.
Most placental mammals (such as human beings) have legs, which they use to move around. However, there are many aquatic placental mammals, such as whales, dolphins, seals, walruses etc., which move mainly by swimming. Bats move mainly by flying.
Most marsupials move on legs just like other mammals.
Legs just like all mammals.
Mammals can move by walking, using either 1, 2, or 4 legs, by galloping, by jumping, by swinging from trees using their arms, etc.some mammals move by walking.some move by swimming.some mammals even crawl.it is according to their habitat
All mammals use internal fertilization.
walk run and swim
All mammals use lungs to breath.
whales and dolphins are both mammals that use waterways.
Sea mammals have large flippers and the y swim or can propel themselves slowly on land.
dolphins are aquatic mammals like seals, and sea lions. They have fins & a strong tail which they use to swim in water.
They are born live and able to move.
Legs you idiot