31.   The birds later died from injuries.

32.   The virus struck several chicken farms suddenly in April and farmers approached the government for help because their birds were dying.

33.   He said the birds died within an hour of showing the symptoms.

34.   Birds are dying of botulism by the thousands at a saltwater lake in southern California, and experts are at a loss to explain the phenomenon.

35.   While birds frequently die of botulism, Klinger said the extent of the deaths was extraordinary.

36.   Ornithologists are at the scene and veterinary experts are carrying out autopsies to discover if the birds died of a virus or were poisoned.