Insects are invertebrates and are the most biodiverse life form on the planet. Insects have achieved the most success compared to other branches of life, being superbly adapted to their environment. Being located in a tropical zone Thailand is a biodiversity hotspot. At least 105,000 species of insects have been discovered, of which only 10% or 10,000 have been named and characterized. Therefore, Thailand still has many insect species which are undiscovered or as yet unnamed. This is also true of Khao Yai National Park, which still has many uncharacterized species as of present.

Fighting giant stag beetle

Scientific Name : Hexarthrius nigritus Lacroix, 1990 (Lucanidae)

There is a fighting giant stag beetle that is only found in Khao Yai National Park. Both sexes are completely black. The male has a strong mandible separating into prongs. The carapace is smooth. The antennae are bent or geniculate, and form 5 segments at the tip. The female is similar to the male but the mandible is smaller. The plate covering the head comes slightly in front of the eyes. The male is 48-80mm and the female 38-41mm

Where to find them

Any light source at night which attracts insects. If you are lucky you will find this unique variant of beetle.

Orange Oakleaf

Scientific Name : Kallima inachus

This butterfly has the distinctive feature of resembling a dry leaf with its wings closed. Under both wings is a brown strip that looks like the midrib of a leaf, giving it excellent camouflage. The top of the wings are blue with an orange strip. Antennae are dark brown. It can be found in rain forest or deciduous forest, but not very often.

ภาพโดย Phanakorn Kraomklang 

Jewelled Nawab

Scientific Name : Polyura delphis delphis

This butterfly flies like a horse jumping, very fast. It lives in deep forest and likes to drink water in streams, salt licks, carcasses or animal dung. It is not frequently found.

ภาพโดย Phanakorn Kraomklang


Long-branded Blue Crow



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Cheirotonus Rarryi


Common Mormon


Blue Begum


Common Cerulean


Giant Rhinoceros Beetle


Common Bluebottle


White Dragontail


Spot Swordtail


Blue Glassy Tiger


Dark Blue Tiger


Intermediate Maplet


Common Grass Yellow


Common Albatross

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