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- Mammals are warm-blooded and hair hair/fur sometime in their life.
- Dolphins and whales are the only sea mammals.
- Blue Whales are the largest mammals on earth.
If Dolphins and whales are the only sea mammals, in which group are you fitting walrus, seals ,sea lions, dugong and manatee ?
Wiki User
∙ 11y ago
Wiki User
∙ 9y ago- Mammals are warm-blooded vertebrates.
- They have a covering of skin or hair/fur.
- All mammals suckle their young with mothers' milk.
- The young of most mammals are born alive, except for monotremes - the platypus and echidna - which lay eggs.
- There are three main groups of mammals: placental, marsupial and monotreme. Monotremes are the egg-laying mammals. Marsupials are characterised by giving birth to undeveloped young which, in most species, must then develop in a pouch.
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