Sut y mae Llywodraeth Cymru yn monitro'r boblogaeth ddraenogod yng Nghymru?
Hedgehogs are challenging to survey with any degree of accuracy as they often inhabit private property, including people’s gardens. This raises issues of permission for access by surveyors. A single hedgehog’s territory may cross several urban properties, so absence from one garden at any one time may not indicate absence of hedgehogs.
The State of Mammals in Wales Report 2020 (StateofMammalsinWalesReport2020-update300621.pdf) written by the Mammal Society and commissioned by Natural Resources Wales (NRW) estimates the hedgehog population to be 56,800 in Wales. Another useful source of information about hedgehog populations is the State of Britain's Hedgehogs 2022 report (SoBH-2022-Final.pdf (hedgehogstreet.org)), published by British Hedgehog Preservation Society & Peoples Trust for Endangered Species.