Ar 6 Rhagfyr 2016, cyhoeddais fod Cymru gyfan yn Barth Atal Ffliw’r Adar.  Gwnes hynny fel ymateb i’r achosion o’r Ffliw Adar Pathogenig Iawn H5N8 a gafwyd ar draws Ewrop, Gogledd Affrica a’r Dwyrain Canol.  Mesur rhagofalus oedd hwn i leihau’r risg i ddofednod ac adar caeth gael eu heintio gan adar gwyllt.  Gwnaed y datganiad o dan Erthygl 6 Gorchymyn Ffliw’r Adar a Ffliw sy’n Deillio o Adar mewn Mamaliaid (Cymru) (Rhif 2) 2006
On 6 December 2016, I declared the whole of Wales an Avian Influenza Prevention Zone. I did this in response to Highly Pathogenic Avian Influenza (HPAI) H5N8 outbreaks across Europe, North Africa and the Middle East. This was a precautionary measure to minimise the risk of poultry and other captive birds being infected by wild birds. The declaration was made under Article 6 of the Avian Influenza and Influenza of Avian Origin in Mammals (Wales) (No. 2) Order 2006.