The Malaysian Forest Scorpion (Heterometrus spinifer) is also known as the Giant Blue Scorpion. This species is also known as the Asian Forest Scorpion in some areas and for this reason it is often confused with the true Asian Forest Scorpion (Heterometrus longimanus).

Although the Malaysian Forest Scorpion is very similar to the Emperor Scorpion in shape and coloration, the Malaysian Forest Scorpion has a stronger sting than the pandinus species. The sting is said to equal that of a hornet. Additionally, Malaysian Forest Scorpions are known to be more territorial, though not as aggressive as the Asian Forest Scorpion. In the wild they usually live under logs and other natural debris. They are terrestrial animals, but may burrow to some extent. In the wild, they feed primarily on insects. Their venom is only slightly toxic, although some people may be more sensitive to it then others. When threatened, they rarely use their tail to attack. Instead, they use their large pedipalp, which is quite capable of drawing blood. Malaysian Forest Scorpions found in the wild are usually more aggressive then those raised in captivity, although many quickly loose their aggressiveness if handled frequently. They can be kept in small groups, although that is not suggested.

The Malaysian Forest Scorpion is quite large, averaging around six inches in length. They are black, with glints of dark bluish green depending on the light and the angle. In the sunlight they do not appear black at all. This is quite different from the Asian Scorpion, which is entirely black in all lighting conditions. The Malaysian Scorpion is also significantly larger than the Asian. In addition to size they can be further distinguished from the Asian by a variety of factors. The most noticeable difference between the two species is the appearance of the claws. The Malaysian's pincers have very smooth grooves in the sides, while the Asian's pincers have no grooves. In addition to that, the Asian's pincers are slightly bubbled. Their appearance is similar to the Imperial Scorpion's claws, but they do not have the extreme bubbling that the Imperial does. The Malaysian doesn't have bubbled pincers at all; they are almost perfectly smooth. Furthermore, the Malaysian holds much wider stance when in an attack posture than the Asian. It spreads its claws all the way apart with the tail aimed directly toward the sky. When the Asian scorpion is in its attack posture, it tends to curl its tail over in a way that is similar to the walking stance, and the pincers are kept almost directly in front of the body as a protection mechanism. Lastly the Malaysian can move a little more rapidly than the Asian. Both species have a cleft between the bases of the chelicerae and powerful pedipalps (claws) at the base of the tarsus. They have a medium to long life span and are quite hardy.

As its name suggests the Malaysian Forest Scorpion is native to Malaysia though it is also seen in some other areas in Asia. Though Heterometrus spinifer is known professionally as the Malaysian Forest Scorpion or the Giant Blue Scorpion in some areas it is also referred to as the Asian Scorpion, Asian Forest Scorpion, or the Malaysian Giant Scorpion.

Adult Malaysian Forest Scorpions can be fed crickets, large insects and occasionally mice. Any uneaten food must be promptly removed from the terrarium however, because uneaten food can attract mites, which are very dangerous and stressful to the scorpion.

They should be kept in a high humidity environment (55%) with high temperatures ranging from 75 to 90 degrees Fahrenheit. They will drink from a wide, shallow water dish. They can be housed in a 2.5 to 20 gallon tank, depending on how many scorpions there are. They should have a floor of at least three inches of potting soil, vermiculite, peat moss or combination, kept moist.

The Malaysian Forest Scorpion is bred regularly in captivity. Babies grow very rapidly. A 6-month-old Malaysian Asian Scorplett can average 2.5 inches in length. This is quite striking when compared to other species, such as Hadogenes troglodytes, whose scorpletts are less than a third of the size at the same age. Malaysian Scorpions usually make good parents and do not eat their young as often as Asian Forest Scorpions.

When caring for babies keep them in a 20-gallon long terrarium if you intend to leave them with the parenting adult. This is much easier than caring for them individually. The mother will kill prey (prey must be at least the same size as the mother's claw and no more than one at a time), and feed her young scorpions while keeping them safe from over-heating or under-heating as well.

Baby Malaysian Forest Scorpions can be separated as they slowly outgrow the burrow they stay in with their mother (about three inches as long as a large amount of substrate is provided as well as a number of burrows). Also, as a note, the substrate seems healthiest for the scorpions if it is kept damp.