linguistic:paraphrasing, information:highlighting
Ecology

Denmark belongs to the Boreal Kingdom and can be subdivided into two ecoregions: the Atlantic mixed forests and Baltic mixed forests. Almost all of Denmark's primeval temperate forests have been destroyed or fragmented, chiefly for agricultural purposes during the last millennia. The deforestation has created large swaths of heathland and devastating sand drifts. In spite of this, there are several larger second growth woodlands in the country and, in total, 12.9% of the land is now forested. Norway spruce is the most widespread tree (2017); an important tree in the Christmas tree production. Denmark holds a Forest Landscape Integrity Index mean score of 0.5/10, ranking it 171st globally out of 172 countries—behind only San Marino.

Roe deer occupy the countryside in growing numbers, and large-antlered red deer can be found in the sparse woodlands of Jutland. Denmark is also home to smaller mammals, such as polecats, hares and hedgehogs. Approximately 400 bird species inhabit Denmark and about 160 of those breed in the country. Large marine mammals include healthy populations of Harbour porpoise, growing numbers of pinnipeds and occasional visits of large whales, including blue whales and orcas. Cod, herring and plaice are abundant culinary fish in Danish waters and form the basis for a large fishing industry.