Of all the remarkable adaptations that make pangolins uniquely suited to their ecological niche, none is more extraordinary than the tongue. Long, whip-like, coated in glutinous saliva, and anchored at a point deep within the chest cavity rather than the floor of the mouth, the pangolin tongue represents one of the most specialised feeding structures found in any living mammal. Understanding how it works illuminates not only pangolin biology but also the remarkable convergent evolution shared with anteaters, aardvarks, and echidnas — unrelated animals that evolved almost identical solutions to the same feeding challenge.
In most mammals, the tongue is a muscular organ anchored at the back of the mouth and used primarily for manipulating food and assisting with swallowing. The pangolin tongue shares these basic properties but differs from the mammalian standard in almost every other respect. Its most immediately striking feature is its length. In a large ground pangolin (Smutsia temminckii) from southern Africa, the tongue when fully extended may reach 40 centimetres or more. In the giant pangolin (Smutsia gigantea), the largest of the eight species, credible field measurements have recorded tongue lengths approaching 70 centimetres — in an animal whose body, from snout to tail base, might measure only 60 to 70 centimetres.
The explanation for this remarkable length lies in where the tongue is rooted. Unlike the tongues of dogs, humans, or cattle, the pangolin's tongue does not attach at the back of the oral cavity. Instead, the hyoid apparatus — the bony and cartilaginous structure that anchors the tongue — extends far back into the thoracic cavity. In smaller species, the tongue root rests near the sternum. In the largest species, the root of the tongue may extend all the way to the last pair of ribs or even into the pelvic region. When the tongue is at rest and not in use, it lies coiled within the chest, a unique anatomical solution to storing an organ longer than the head and neck combined.
Anatomy note: The pangolin hyoid apparatus extends from the base of the skull through the thoracic cavity. In giant pangolins, the complete tongue-and-root system, including the hyoid bones, may reach 90 centimetres in total length within the body.
Length alone would be useless without an equally extraordinary adhesive system. The pangolin tongue achieves its insect-trapping function through a coating of highly viscous saliva produced by enlarged salivary glands. Comparative anatomical studies have shown that pangolin salivary glands are massively developed relative to body size, far exceeding the proportions found in comparably sized carnivores or herbivores. The submandibular and sublingual glands are particularly enlarged, delivering a continuous supply of mucin-rich saliva to the tongue surface during active foraging.
The adhesive property of pangolin saliva derives principally from mucins, which are large glycoprotein molecules with a protein backbone to which multiple sugar chains are attached. This molecular architecture creates a viscoelastic fluid that behaves like a slow-moving gel under gentle conditions but resists rapid deformation — meaning it stays on the tongue surface during the rapid insertion and retraction cycle but clings tenaciously to any insect that makes contact. Worker termites and ants, whose exoskeletons present a large surface area relative to their mass, adhere almost instantly.
The exact biochemical composition of pangolin saliva has been studied in captive animals and shows similarities to the mucin composition of other myrmecophagous (ant- and termite-eating) mammals, providing a compelling example of convergent molecular evolution. The same functional outcome — a glue-like saliva ideal for trapping small hard-bodied insects — has arisen independently in pangolins, giant anteaters in South America, and the aardvark of Africa, despite these animals being only distantly related.
Watching a ground pangolin feed at a termite mound in South Africa's savannah provides a vivid illustration of how tongue and saliva work together. The animal approaches a mound, uses its powerful front claws to excavate a small opening, and then inserts its slender snout. The tongue is then protruded at extraordinary speed — high-speed camera studies of related species show tongue protraction rates of approximately 0.25 seconds per cycle — and retracted laden with adhering insects. The cycle repeats dozens of times per minute.
The speed of the tongue stroke is critical for two reasons. First, the alarm response of many termite species is rapid: soldier termites begin responding to mound disturbance within seconds, and the colony may block galleries or mount a defence within minutes. A pangolin that feeds slowly at one spot risks both reduced prey capture and chemical attack from defensive soldier termites. Second, the rapid tongue stroke generates the kinetic energy necessary to separate insects from tunnel walls and carry them free as the tongue retracts.
Efficiency is also enhanced by the tongue's surface texture. Microscopic examination of pangolin tongue tissue reveals a covering of dense, filiform papillae — small backward-pointing projections — that increase surface area and mechanical grip on adhering prey. The combination of physical texture and mucin adhesion means that even vigorous struggling by prey insects does not dislodge them before the tongue is retracted into the mouth.
Pangolins have no teeth. They are entirely edentulous, having lost their dentition completely over evolutionary time. This means that insects captured by the tongue cannot be chewed in any conventional sense. Instead, swallowing involves passing the bolus of insects from the tongue into the oesophagus and down to the stomach. The pangolin stomach is highly unusual: its muscular walls are keratinised (reinforced with the same protein that forms their scales and human fingernails) and contain small stones or grit that the animal deliberately ingests. The churning action of the muscular stomach walls, combined with the abrasive grit, grinds the insects mechanically — a function that serves as a gastric mill, replacing the grinding action of teeth.
Feeding rate: Ground pangolins in South Africa's Tswalu Kalahari Reserve have been observed completing up to 200 tongue insertions per minute at active termite mounds, each stroke capturing multiple prey items. A single foraging visit to a large mound may last 10 to 15 minutes before the animal moves on.
The extraordinary efficiency of the pangolin tongue translates directly into ecological impact. Studies using scat analysis and foraging-bout observation in South Africa's Limpopo and North West provinces estimate that a single adult ground pangolin consumes between 140 and 200 grams of insects per night, equating to tens of thousands of individual termites and ants. Over a full year, a single pangolin may remove 10 to 30 million insects from the local environment.
Termites in particular play complex roles in savannah ecology: they decompose dead wood and plant matter, aerate soil, and their mounds concentrate nutrients. Pangolin predation moderates termite colony growth and prevents any single colony from becoming dominant. In agricultural areas bordering reserves in South Africa and Zimbabwe, pangolins provide a measurable pest-control service, reducing termite damage to timber structures and crops.
While all eight pangolin species share the same fundamental tongue architecture, there are meaningful variations across the African and Asian species that reflect different prey bases and habitat types.
The tongue and salivary system cannot be considered in isolation from the conservation crisis facing all eight pangolin species. Animals rescued from illegal trade and placed in rehabilitation facilities in South Africa, Zimbabwe, and across Asia frequently face tongue injuries from wire snares, dehydration that disrupts salivary viscosity, and stress-induced anorexia. Rehabilitators working with pangolins in southern Africa report that even minor tongue abrasions can prevent feeding for weeks, requiring hand-feeding of live termite colonies extracted from carefully sourced mounds.
Understanding the precise dietary requirements that the tongue anatomy serves — specifically the dependence on live, active termites and ants rather than any substitute food source — is one reason why pangolin rehabilitation has historically had poor survival rates compared to other wildlife species. Captive husbandry protocols developed over the past decade, drawing on detailed anatomical and dietary research, have improved outcomes, but pangolins remain among the most challenging species to care for in captivity.
In large species such as the giant pangolin, the tongue can reach 40 to 70 centimetres, sometimes exceeding the animal's own body length. Smaller species have proportionally shorter tongues, but all extend well beyond the snout when fully protruded.
Pangolin saliva contains mucins, large glycoprotein molecules that create an extremely viscous, glue-like fluid. When the tongue contacts insects inside a mound, they adhere instantly. The stickiness is sufficient to trap worker ants and termites on contact and hold them through the rapid retraction stroke.
The pangolin's tongue attaches near the sternum or, in some species, close to the pelvis — not in the mouth. This lets the tongue be stored coiled within the chest cavity when not in use, allowing for extraordinary total length.
A medium-sized pangolin in South Africa can consume 140 to 200 grams of insects per night, equivalent to roughly 10,000 to 70,000 individual ants and termites. Over a full year, one pangolin may eat tens of millions of insects.