It's a source citation. The name Breenan is the author, and 142 is probably the page this information was found on in Breenan's writing.
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Mammals (Mammalia) are a class of vertebrate homeothermic amniotes (of "warm blood") that possess milk-producing mammary glands with which they feed the young. Most are viviparous (with the notable exception of the monotrematas: platypus and echidnas). A clear example of a mammal is man and his best friend, the dog.
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"Aha!" Said Dan. "wow..." said Todd in a mysterious manner. ETC... so on and so forth
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