The South lying between Andaman sea and the Gult of Thailand. Peninsular Thailand is the southern part, which is a part of Sunda faunal sub-region. Small areas of rainforest are also found in the wettest areas of South-east Thailand. Bird species diversity in this forest type is very high. This forest type also supports a great diversity of bird species including pheasants, pigeons, cuckoos, owls, trogons, hornbills, kingfishers, barbets, woodpeckers and many passerine families Hill evergreen forest occur above 900 m or 1,000 m on the higher peaks thoughout the country especially the north, west, some in the Southeast and Peninsula.
Dominant trees are oaks and chestnuts etc.
Mixed deciduous forests occur in the plains or valleys and on hill slope to 1,000 m, they are found in the North, Northeast and Southwest regions. Teak is dominant in this forest type. Dry dipterocarp forests occur in all the lowland but the largest and least disturbed areas are found in the North and West. This supports a lower range of birds species than other forest types as there is less middle storey and under-storey vegetations. One species of forest birds, the Limestone Wren Babbler is confined to limestone habitats and is found in small areas of the North, Southwest and at the southwest margin of the Khorat Plateau in the Northest region.