Mammal Characteristics

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Across
  1. 3. The thing all mammals must breath in, using their lungs.
  2. 5. A row of vertebrates that run down the back of an animal.
  3. 7. A mammal that grows inside its mother fully, feeding from the placenta.
  4. 8. A rare kind of mammal that births an egg.
Down
  1. 1. A mammal whose baby finishes growing in its mothers pouch.
  2. 2. The ability for an animal to maintain their own body temperature.
  3. 4. When a mammal births a baby, not an egg, it is a what?
  4. 6. A covering made from keratin that all mammals have at some point.