1. Monotremes are mammals that lay eggs

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2. Mammals seem to have originated from an extinct species called cynodonts

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3. Most mammals are known as 'placental', which can be found on land and in oceans

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4. Encephalization quotient is the ratio of brain matter area to body matter area. It tells how intelligent mammals are. For example, a human's EQ is 7.4, and a dolphin's is 5.6

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5. There are over 4000 types of mammals

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6. There are 21 groups of mammals

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7. The era in which mammals ruled dominance is called the Cenozoic era. It occurs 65 million years ago to now.

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8. All mammals have teeth except the Vermilingua (anteater)

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9. The largest mammal is the Balaenoptera musculus (blue whale)

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10. The smallest mammal is the Craseonycteris thonglongyai (bumblebee bat)