The trees are not marked in anyway but the number of trees on the site marks the number of births allocated to that site and is monitored.
Nid yw’r coed wedi’u marcio mewn unrhyw ffordd, ond mae nifer y coed ar y safle’n cynrychioli nifer y genedigaethau a glustnodwyd ar gyfer y safle hwnnw, ac mae’n cael ei fonitro.