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Last week a comma butterfly, fresh from hibernation, guarded my house for three sunny days.

The comma butterfly was in severe decline in the 20th Century and had become restricted to south east England and parts of the Welsh borders.

And some species really moved—the comma butterfly has shifted 137 miles north in just two decades.

"Meanwhile, the comma butterfly has moved 220 kilometres northwards from central England to Edinburgh, in only two decades."

But the comma butterfly was able to make the leap from central England to Edinburgh, a distance of about 137 miles, in two decades.