Differentiation is a branch of Calculus - a broad and often trickymathematical discipline. Here we will start simply, with how to differentiate between a stoat and a weasel.
Weasel
Stoat
As you can see, the stoat is slightly larger than the weasel,
and has a black tip to its tail.

ADVANCED DIFFERENTIATION

In winter, the stoat grows a white coat, becoming the ermine.
Ermine
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