Quick Change

I am a clever animal –
My summer name is STOAT,
And when the sun is warm and bright,
I wear a nice brown coat.

But when the wintry  days return,
And all the trees are bare,
I change my colour, and my name  –
And Mr Stoat’s not there!

I’iv changed to Mr ERMINE,
And my coat’s a lovely white.
You wouldn’t see me in the snow,
But I’m a handsome sight.

It isn’t easy to remember
That I’iv not one name, but two,
But it’s nice to have a change of clothes –
What do other creatures do?