The stamps show five different mammals that live and breed in the Danish countryside, roe deer, hedgehog, black squirrel, dormouse and stoat.
Five Danish Places selected as World Heritage Sites can be seen on the stamps.
The Danish flag turns 800 in 2019. Over the years, the flag has flown over Denmark in times of war and peace, joy and sorrow, and it has gradually developed into a unifying symbol for the country.