Meet Ab-Baa - the four lambs born to Super Trouper mum Keira.

The quad - named Benny, Bjorn, Anni and Agnetha after the Swedish pop band - were born on Terry Wigmore's farm in East Dean, Sussex.

The chances of four lambs being born at once are slim, happening only once every four years at the Seven Sisters Sheep Centre.

On average each lambing sheep at the centre, numbering about 300, usually gives birth to one or two lambs a year so four lambs is a turn up for the books.

Terry, 60, who has been farming for 45 years, said: "The four of them are doing fine and are in good health.

"We have had to top a couple of them up with milk as five-year-old Keira hasn't got enough for all of them.

"There was no panic when she was giving birth.

"We were watching and it was a bit of a surprise "She had one and then she had two, then three - blimey she's had four.

"They are pure bred so we'll keep all four of them and breed from them. Unfortunately the wool isn't worth much these days but as they're British Milk Sheep we'll milk them on the farm to make yoghurt and cheese."

The Seven Sisters Sheep Centre, on Gilberts Drive, East Dean, opens daily for school and public visits.

It has a large collection of different sheep breeds, including many now not see on modern farms.

Visitors can help feed the lambs, meet the animals, watch the sheep being milked and learn how cheese is made.

They can also watch sheep shearing and discover how wool is spun.

Terry said: "This is our 20th year open to the public.

"We have the largest collection of breeds in the world with 49 different breeds.

"The British Milking Sheep is a pretty rare now. It's one of the new breeds which was started about 30 years ago for milking from several different breeds.

"Now there are not many of them around."

He added the four lambs would begin milking in two years once they are old enough to lamb themselves.

You can see the four lambs at the Seven Sisters Sheep Centre by calling 01323 423207 to arrange a visit.

Alternatively you can visit www.sheepcentre.co.uk Can you think of better names for the lambs?