Tokay Gecko (Gekko gecko), a nocturnal gecko.
The Tokay Gecko is indigenous to Asia, parts of India, Indonesia, and the Philippines, they have also been introduced to Hawaii, Florida, and some Caribbean Islands.
Their native habitat is rainforest trees and cliffs, and they also frequently adapt to human habitations, roaming walls and ceilings at night in search of insect prey. We have a couple of Tokay Geckoes roaming around our restaurant, and some appear in our rooms from time to time.
The typical lifespan is 7–10 years.
Tokays are the second largest gecko species, attaining lengths of about 30-40cm (males), 20-30cm (females) and weights of 150-300g. They are distinctive in appearance, with a blueish or grayish body sporting orange or red spots.
Tokay geckoes are aggressive carnivores which will eat a variety of insects and even small mice. Their aggressive behaviour can lead to attacks on other male Tokays, other gecko species, and also human handlers.
They are renowned for their aggressive disposition and (unusually for lizards) their loud vocalizations. Their mating call, a loud croak, is variously described as sounding like tokeh or gekk-gekk, whence both the common and the scientific name (deriving from onomatopoeic names in Malay, Sundanese or Javanese), as well as the family name Gekkonidae and the generic term gecko.
Luckily the Tokay Geckoes we encounter, appear to be incredibly timid animals towards humans. However, they do hunt their pray aggressively which occasionally results in them dropping of ceilings.
Personally, we have not heard of anyone having seriously been bitten by a Tokay Gecko, but according to Tokay Gecko owners the bite of a large Tokay Gecko is painful and can draw blood. Once having bitten, it will not readily let go. Tokay Gecko owners claim that the only effective way to get these animals to release in to submerge them in water.
Thank you Jo Sueker, Minnesota Herpetological Society, for supplying the additional information below:
“… Hot air is a faster release technique, and safer for all, if done correctly. I use a HAIR DRYER (set on lowest temp, lowest speed) and hold it no closer than 8cm/3in while aiming the hot air “along the smile”.
Move air in a slow arc from one cheek, under throat, to the other cheek, and back.
Avoid hot air on the eyes; geckos have no eyelids to protect their eyeballs.
The gecko (and most other lizards, amphibians, and snakes) should let go quickly. Once it lets go, it will likely start defensive head swings (with that wide open, black-throated mouth) to find a second target to bite, so pull whatever/whoever the gecko was biting quickly away.
If you looked closely during the bite, you should have seen two sharp folds at a right angle right behind each eye because the gecko had clamped its jaw into a locked position that is almost impossible to release. Trying to pry the jaw usually does not work, the gecko will lose teeth and bleed, and the bitten object usually becomes further damaged. My experience is that, the more you try to pull the bitten object away, the more you see the gecko “blink down” its eyes, resetting the jaw clamp. Bottom line is that fighting against the bite will most likely harm the gecko (including breaking its jaw) and the bitten object.
Another method that should be faster than plain water is using grain alcohol (rum, whiskey, etc). I have not used this method, yet snake handlers in our society attest to it. (Seems that, for the men, it is more likely they will have alcohol nearby than a hair dryer.) Start by slowly pouring the alcohol into a crack on the mouth or on the gecko’s snout and face. Again, if the gecko does release, pull back quickly so it doesn’t just clamp down in a new bite. If preferred and possible, pour the alcohol into a container just large enough to hold the gecko and bitten object and submerge the two.
When the gecko is a “pet”, have someone (preferably a competent animal handler) grab the gecko in a safe “shoulder clamp”, with forefinger and thumb circling firmly around shoulder/under jaws and all legs within the closed hand. Letting the neck have freedom often results in more defensive head swinging and more stress on the gecko. Try to move to a darker place or in shade/shadow. Tokays are nocturnal and bright light add stress. I have good results talking with a quiet, soothing voice to help the gecko calm down. I gently stroke my geckos slowly with a finger from between their eyes to nose tip while crooning “gentle” just as slowly with each stroke.
We have had great success “taming” our geckos, but they may still try to bite in defense when surprised, when a stranger moves their hand too close, when a cat hasn’t learned to stay back, etc. I am often asked if any of my animals bite and I always answer, “Anything that has a mouth can bite. You won’t bite my ____, will you?”
Thank you for including positive references to Tokay geckos on your site. They are beautiful, great insect eaters, and, for us, lovely companions. I hope this helps!
Crystal, Minnesota, USA
Minnesota Herpetological Society
Normandale Community College”
Healthy Tokays tend to have large appetites. They feed on larger insects like moths, crickets, grasshoppers, locusts and cockroaches.
Females will lay their eggs in clutches of two, usually on solid vertical surfaces.
Eggs hatch in anything from 60 to 200 days but with most hatching at around 90 to 100 days. Lower temperatures will lead to longer incubation time. These geckos’ sex is temperature dependent, with higher temperatures leading to male hatchlings.
In some countries Tokays are considered food and they are also used in some Chinese medicinal preparations.
Tokays have been used extensively to study the selectively adhesive properties of gecko feet, and indeed most of our knowledge about these properties stems from studies of Tokays. These studies have shown that geckos can cling upside down to polished glass, and the method by which the Tokay Gecko accomplishes this is hidden in its feet.
The pads at the tip of a gecko’s foot are covered in microscopic hairs. Each of these hairs splits into hundreds of tips only 200 nanometers in diameter. By using these tiny hairs that can adhere to smooth surfaces, geckos are able to support their entire body weight with a single toe. The adhesive force created by these hairs, called setae (pronounced see’ tee), lining the gecko’s toes is estimated to be so strong that a single seta can lift the weight of an ant.
The strong adhesion is caused by an intermolecular force called Van der Waals force. This force is weak until it gets very close to a surface. When the surface it contacts is large, it can add up to a strong attraction. Van der Waals forces occur when unbalanced electrical charges around molecules attract each other. The charges are always fluctuating and can sometimes reverse direction, but the outcome is that they draw molecules together, such as molecules in a gecko’s foot and molecules on a smooth wall.
To release their feet (to break the intermolecular force) they curl their toes. When a toe is at an angle of 30 degrees the binding breaks.
It is considered lucky in Cambodia if a Tokay lets out 7 or more calls, and unlucky if there are fewer than 7 calls.
Sometimes a Tokay loses – part of – its tail during fights with other Tokays. Their tails will grow back. Spotting a two-tailed Tokay Gecko is considered good luck.