The former prime minister's plans at his new home had been threatened by the presence of great crested newts.
The £3.8m 17th Century property, which Mr Johnson and his wife Carrie bought earlier this year, is bordered on three sides by a moat.
It is an offence to deliberately kill, injure or capture them, or damage their breeding sites and resting places. He said the rules may "sound barmy" but added that the UK must protect the animals "or posterity will not forgive us".
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