An avian flu case has been confirmed after a swan was found dead in Cardiff Bay.
City council officials say a number of dead birds found at Roath Park Lak and Hendre Lake are also being tested for the H5N1 strain of the virus.
Last month, the Welsh Government told owners of more than 50 birds to keep them housed indoors, amid warning of a 'very high level' of the highly pathogenic diesease.
Cardiff Council is advising the public to avoid feeding wild birds in public places as it encourages them to gather, thus increasing the risk of transmission.
A spokesperson said: "It's very rare for the H5N1 strain of the flu to be passed onto humans, but as a precaution, please avoid contact with dead or sick birds."
"If you touch any dead birds, droppings, feathers or other material that has touched a dead bird, wash your hands thoroughly with soap and water as soon as possible."
Any sightings of dead birds should be reported to DEFRA / APHA online or by calling 03459 33 55 77.

Vale Councillor blasts school funding in the county
Bear Field Skate Park set for major upgrade as part of new Placemaking Plans
New apprenticeship courses in construction to be introduced in Wales
Former Penarth Bank could become a cafe
New poll shows majority of Welsh voters lack voting confidence ahead of Senedd Election
Construction hub secured for rail upgrades
Prolific thief banned from Holton Road
Cowbridge: plans for more holiday lodges
Man dies suddenly in Romilly Park
Cash boost for Sully Primary School
Speed limits reduced despite objections
Concern over imported chicken in school meals
A48 closed after three-vehicle collision
Rhys unveils red bench 'in living memory'
Barry: plans lodged for 70-home development
Plans to revamp Heritage Coast centre
Carnival drummers join pirate opera encore