An animal cruelty investigation has been launched after three alpacas were found beaten to death on a farm in Buckinghamshire.
Two were attacked in their shelter on January 6 and the third was found dead the next day in Little Kingshill, near Great Missenden.
A spokeswoman for the RSPCA described the killings as a "sickening act of cruelty".
The owners of the animals, Lesley and Andrew Sapsford, are said to be heartbroken and are now worried for the safety of 80 other alpacas they keep.
Mrs Sapsford said: "We can’t believe that anybody would be so cruel. We’re so worried about our other alpacas now. We can’t process the evilness of it all.
“At this time of year there isn’t any grass on the field so we feed them concentrate, which means they would have seen someone coming onto the field thinking that they were going to be fed.
“Our alpacas have never been treated badly by a human before. We’re so worried about our other alpacas now. Whoever has done this could do it again.
“If anyone saw anything, heard our alpacas screaming, saw any strange cars, anything at all which would give us a lead, please report it to the RSPCA or the police.”
Two of the alpacas were pregnant and found dead in their shelter last Saturday.
The following day a four-month-old alpaca named Ragamuffin was also found dead in the shelter.
A post-mortem examination carried out by a vet showed that they had all suffered blunt force trauma.
RSPCA inspector Rachel Smith said: “This is a sickening act of cruelty which has left the owners devastated. It is very concerning that someone would think it acceptable to do this to an animal.”