There are 18 different species of woodpeckers that can be found in Khao Sok National Park. The Great Slaty Woodpecker is the largest in the world, measuring about 50 cm and weighing 450g. Members of the Picidae family have strong bills to drill and drum on trees with, and long sticky tongues to extract food. Woodpeckers have four toes – two facing forwards and two facing backwards, giving the birds good grip on trees. Most of the species are categorized as ‘lower risk, least concern’ but two species (the buffnecked woodpecker and the olivebacked woodpecker) are ‘near threatened’ on the IUCN Red List.