museumwales: Wedi troi’n garreg, ond nid ffosil! Nyth aderyn petraidd, wedi’i greu drwy
museumwales:Wedi troi’n garreg, ond nid ffosil! Nyth aderyn petraidd, wedi’i greu drwy gael ei roi mewn dŵr llawn calsiwm.Turned to stone but not a fossil, a petrified birds nest, produced by being placed in calcium rich waters. -- source link
#very cool#bird clique#stones