No. Birds are not mammals.
Mammals are not covered with feathers. Mammals grow hair, but do not have to be covered with hair. Birds are covered with feathers.
No. Only birds have feathers. Kangaroos are mammals, not birds.
Cassowaries are birds so, like all birds, they have feathers. Only mammals have fur.
No. Marsupials are mammals, so they have fur or hair. Only birds have feathers.
Only mammals have mammary glands. These are the means by which the female nurtures her young on mothers' milk. Mammals are also the only vertebrates with fur or hair.
Birds have wings and feathers.
Birds lay eggs and mammals don't and birds of course have feathers.
Birds have feathers and light hollow bones. Mammals have fur or hair and heavy bones. Bird have a gizzard to break down food. Mammals only need a stomach. Birds lay eggs. Mammals give birth to live young.
Mammals do not have feathers and generally do not lay young in eggs.
Mallards,or Anas platyrhynchos, are birds, not mammals. Birds are warm-blooded, have feathers, a beak, and lay eggs.
They are not mammals. They are actually birds because they lay eggs and have feathers, wings, and the bone structure of birds.
Dogs don't have feathers mainly because they're mammals. Birds (which are not mammals) have feathers because they're lighter and more aerodynamic than fur, making it easier to fly, but fur is warmer than feathers, meaning that it's useful for mammals.