Meet the barking gecko: Tiny desert lizard with astonishing vocal skills for survival and communication in Africa’s harshest environments

One of the strange, small reptiles living within the giant deserts of Southern Africa is the barking gecko. It is unusual and strange to find a small gecko that barks very loudly and scares the wits out of not only humans but also other animals. They belong to the genus Ptenopus; interestingly, all of its species have specialised to an extraordinary level, allowing them to efficiently live within the extremely harsh conditions of the deserts. Their small, sand-coloured bodies easily blend into the sand, and they use their strong, clawed feet to create highly efficient burrows that protect them from predators and scalding temperatures. Their burrows are also used as the source from which they come out at night to look for insects and communicate how they do by barking loudly.Barking geckos have developed in ways that enable them to lead a life in arid regions. While many geckos have sticky pads, enabling them to scale smooth surfaces, these lizards have strong, clawed feet designed for digging. Burrows act as their key refuge: a place of shelter not only from extremely high daytime temperatures but also from would-be predators. Nocturnal in habit, they pass much of their time underground during daylight hours, while at nightfall, they emerge to hunt. Their diet mainly includes insects and small invertebrates, which they capture through stealth and agility. Despite their small sizes, these geckos are highly capable hunters that show how even the tiniest reptiles can thrive in a harsh environment.For lizards, communication that involves sound is extremely rare; barking geckos have mastered the art, though. They produce all types of different barks, each with its specific meaning. Some calls establish territory, warning rivals to stay away, while others function as mating signals, attracting partners. Even young geckos emit soft barks, signalling distress or calling for attention from adults nearby. These vocalisations are not random noises but a complex system of messages enabling the geckos to interact and coordinate despite the vast, open desert. Scientists are intrigued by this behaviour since it challenges the supposition that reptiles are generally quiet and socially simple.Barking geckos are very dependent on burrows, which are far beyond simple shelter. Burrows excavated in the soft sand deserts provide a much cooler and more stable temperature compared to the harsh conditions experienced in the environment. They further protect themselves from most predators, including snakes and birds. Reproduction is done in these safe burrows, which significantly decrease the threats to the young. As such, the burrows surround the whole life of geckos, giving them security, hunting grounds, and social areas. These include barking geckos that are known to employ vocalisations as an element of communication. These barks consist of unique changes in pitch, rhythm, and volume that all relay different messages. These are strong enough to overcome several meters of sand in arid desert habitats and louder than what may be produced by natural environmental factors such as wind and other creatures. Even the smallest creatures, such as these reptiles, could employ significant social behaviour as well as intellect in utilising sound as an adaptation in one of the most hostile settings on Earth.