* Give birth to live young: Tigers don't lay eggs. Instead, they give birth to live cubs.
* Nurse their young with milk: Tiger mothers provide milk to their cubs, nourishing them until they are able to eat solid food.
* Have hair or fur: Tigers have a distinctive orange and black striped coat, which is made of fur.
* Warm-blooded: Tigers maintain a constant internal body temperature, regardless of the external environment.
* Breathe air: Tigers have lungs and need to breathe air to survive.
These are the key features that distinguish mammals from other animal groups like reptiles, birds, fish, and amphibians.