Bird flu or Avian flu, also avian influenza, bird influenza, means flu from viruses adapted to birds, but is sometimes mistakenly used to refer to both other flu subsets such as H5N1 flu or the viruses that cause them such as H5N1.
Migrating Siberian birds under suspicion

Bird Flu :: Migrating Siberian birds under suspicion
Brent geese are returning to estuaries and harbours along the East and South coasts. They have flown here from Siberia, so they are under suspicion of carrying bird flu, but there is no serious evidence that they might bring it with them -- The Times.
These Siberian birds are of the dark-bellied race of brent geese. There is also a pale- bellied race that migrates from Canada and Greenland, and spends the winter in Ireland.
(
Bird Flu :: Migrating Siberian birds under suspicion published at
SpiritIndia on Sunday, October 29, 2006)