 Forest covers about 12 @.@ 6 % of the country , most of it designated for commercial production . Forested areas typically consist of <unk> plantations of non @-@ native species , which may result in habitats that are not suitable for supporting native species of invertebrates . Remnants of native forest can be found scattered around the island , in particular in the Killarney National Park . Natural areas require fencing to prevent over @-@ grazing by deer and sheep that <unk> over <unk> areas . <unk> in this manner is one of the main factors preventing the natural regeneration of forests across many regions of the country . 
