FACT CHECK: Is it true that tuko can alert you to intruders better than guard dogs?

A tujo’s loud call is mainly used to defend its territory and attract mates.

A social media post claiming that the familiar “tuko” is a better home security system than a guard dog has been gaining attention online, prompting curiosity over whether the loud gecko is really capable of warning homeowners about intruders.

The viral post describes the Tokay gecko (Gekko gecko) as a natural alarm system and pest controller, saying the reptile’s booming “tu-ko!” call can signal the presence of strangers around a house.

The claim, however, comes with an important caveat: while it is rooted in real animal behavior, experts say it should not be taken literally.

The Tokay gecko is indeed a highly territorial and nocturnal lizard. It is extremely sensitive to vibrations, sudden movements, changes in light, and disturbances within its territory. If something—or someone—passes near its hiding place, the gecko may respond by hissing or producing its distinctive call.

That means a passing person, stray cat, rival gecko, or even a large insect could trigger the same reaction.

Because of this, the tuko has earned a reputation in parts of Southeast Asia as a “natural alarm system.” However, unlike a trained guard dog, the gecko is not intentionally protecting the household or distinguishing between a burglar and an ordinary disturbance.

Its loud call is primarily used to defend its territory and attract mates, not to warn humans of danger.

The post’s other claims are largely accurate.

Tokay geckos are effective natural pest controllers, feeding on cockroaches, beetles, moths, spiders, and occasionally even small rodents. Their presence can help reduce household pests without the use of chemical insecticides.

The species is also known for its aggressive territorial behavior and powerful bite when threatened.

The Tokay gecko is classified by the International Union for Conservation of Nature (IUCN) as a species of Least Concern, although populations in parts of Southeast Asia face pressure from illegal wildlife trade.

While the viral comparison makes for an entertaining way to appreciate the species, wildlife advocates say homeowners should think of the tuko as a helpful housemate rather than a substitute for a security system.

In other words, a tuko might alert you that something has disturbed its territory—but whether that’s an intruder, another gecko, or a wandering cat is another story.

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