Nature in picture
The following defines a mammal :
Mammals are capable of controling their body temperature
the same as we humans can.
A mammal ( if female ) can produce milk to feed its young.
A mammals have some hair at least at the beginning of their lives.
The middle part of their ear contains 3 bones.
The lower jaw of a mammal is a single bone on either side.
All mammals have a diaphragm.
The heart of a mammal has a main artery leaving the heart curves to the left.

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Nature in picture