Malaria has wiped out 10 penguins at Exmoor Zoo.
The Zoo, which has had the birds since it opened in1982, says all of its penguins died following the "quick and devastating outbreak".
Some of the birds were descedants of parents of original birds bought to the zoo when it opened.
The zoo says despite best efforts of the staff and vets, all the birds died in just nine days once the outbreak of avian malaria struck.
Danny Reynolds, living collection manager at the zoo, said some of the staff had hand-reared the birds from birth.
He added many of the symptoms had been hidden and hard to spot.
The zoo is now considering whether to reintroduce penguins back to the enclosure.
Fond farewells have now been said to the colony of penguins - Buster, Newquay, Ludo, Percy, Lemmy, Truddle, Owlie, Blossom, Friendly and Arthur.
- What is avian malaria?
Avian malaria can be carried by all wild birds and although is not infectious to us or the wild birds, penguins have never had to build an immunity to this as they live on or near the sea where the insects that carry the disease do not occur.