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==Key Stage 3==
===About Mammals===
: Only two '''mammals''' lay eggs; the echidna and the duck billed platypus.
==Key Stage 4==
===Meaning===
[[Mammal]]s are a [[class]] of [[verebrate]] [[amimal]]s which feed their young with milk and keep a constant internal [[temperature]].
===About Mammals===
: Only two '''mammals''' lay eggs; the echidna and the duck billed platypus.
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=sz3Yv3On4lE}}