This document discusses key characteristics of mammals. It notes that mammals are vertebrates that have hair, produce milk to feed their babies, and are endothermic, meaning they regulate their own body temperature. Producing milk allows mammals to spend more time teaching their young skills to survive independently.

1. Recurso educativo didáctico abierto
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Salvador Penagos – Eufredo Mendoza
2015

2. Are vertebrates (which means they have a
backbone or spine)

3. Have hair on their bodies.

4. Produce milk to feed their babies. This allows
them to spend more time with their young and
teach them important skills they need to
survive on their own.

5. Are endothermic. Also known as “warm-blooded,”
endothermic animals regulate their own body
temperate which allows them to live in almost
every climate on Earth.