mammal

definition: 
A warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, females that secrete milk for the nourishment of the young, and (typically) the birth of live young
sentence: 
The domestic animal is the first mammal known to die of the disease in Europe.
The first small mammals evolved from reptiles about 200 million years ago, and the group diversified rapidly after the extinction of the dinosaurs to become the dominant form of land animal, with around 4,000 living species.
difficulty: 
easy
toefl frequency: 
2
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