She added “three little baby otters that had been underneath the tree” were discovered.
Ms Tansey said it was thought the only thing to do was take them “into our security where they were nice and warm” and the otter charity was contacted.
“They had a volunteer out to us within two hours, which was absolutely great for us, because we were a bit worried that we couldn’t look after these little pups.
“Obviously they’re so small. They still need hand feeding.”
The otters are currently still in Warwickshire.
Otters have been present at Compton Verney since 2020, but this is the first confirmed breeding on site.
Asked what the discovery on Thursday told people about the grounds, Ms Tansey said: “I think it tells us that we’re secluded enough for the otters to be happy enough to breed there.
“I think it also tells us that the water…is pretty clean. It’s clean enough for the otters to build a home there and to start a family.”