The National Ecosystem Assessment carried out in 2011 showed that both managed pollinators (honey bees) and wild pollinators (such as bumblebees and butterflies) have been declining for 30 years.
Dangosodd yr Asesiad Ecosystemau Cenedlaethol a gynhaliwyd yn 2011 fod pryfed peillio cadw (gwenyn mêl) a phryfed peillio gwyllt (fel cacwn a gloÿnnod byw) wedi bod yn dirywio dros 30 mlynedd.