Loads of turkeys have been infected with the most dangerous type of bird flu at a farm in the east of England.
About 6,500 turkeys, ducks and geese at the farm on the border between Suffolk and Norfolk are being put down to stop the disease spreading.
They have the strain of the bug called H5N1, which can affect humans who have been in close contact with the birds.
It is still very hard for the bug to spread to people. It's not clear how the turkeys caught the disease.
The affected farm is being closely monitored by bird flu experts, and there is a ban on moving farm birds in the area.
The last outbreak of bird flu in the UK happened in February.
More than 160,000 birds had to be killed after the H5N1 form of the disease was found at a turkey farm in Suffolk.