Commin Characteristics of MammalsWarm-blooded (Endothermic) - Mammals can regulate their body temperature internally, keeping it constant regardless of the environment.Have Hair or Fur - Mammals have hair or fur on their bodies which helps in insulation and protection.Give Birth to Live Young - Most mammals give birth to live offspring (except monotremes like the platypus which lay eggs).Mammary Glands - Female mammals have mammary glands that produce milk to feed their young.Have a Backbone (Vertebrates) - Mammals have a spine made of vertebrae, making them vertebrates.Three Middle Ear Bones - Mammals have three tiny bones in the middle ear (malleus, incus, stapes) that help in hearing.Diaphragm Muscle - Mammals use a diaphragm to help with breathing, improving oxygen intake.