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==Key Stage 1==
===Meaning===
A '''mammal''' is an [[animal]] with a [[backbone]] that feeds its young with [[milk]] and usually has hair.
: Singular [[Noun]]: '''Mammal'''
==Key Stage 2==
===Meaning===
A '''mammal''' is an [[animal]] with a [[backbone]] that feeds its young with [[milk]] and usually has hair.
===Lifecycle of Mammals===
==Key Stage 3==
An [[animal]] with a [[backbone]] that feeds its young with [[milk]] and keeps a constant internal [[temperature]].
: Only two '''mammals''' lay eggs; the echidna and the duck billed platypus.