Reptiles
Flap-footed Lizard
Pygopodidae · also called flap-footed lizards, legless geckos, snake-lizards
A flap-footed lizard looks exactly like a snake at first glance, right down to the long, legless body gliding through the grass — until it blinks. True snakes cannot do that at all, and that single small detail, along with a pair of external ear openings snakes also lack, is often the easiest way to tell this Australian gecko relative apart from the animal it has evolved to resemble.
Overview
Flap-footed lizards, family Pygopodidae, are legless, snake-like lizards found only in Australia and New Guinea, most closely related to geckos rather than snakes. They hunt spiders and other invertebrates by night, with tiny, non-functional flaps near the tail base marking where hind legs once were.
A living stage between gecko and snake
Movable eyelids and external ear openings — both absent in true snakes — give away their lizard identity despite the near-total limb loss. Like their gecko relatives, several species can squeak audibly when threatened, and all can shed a thrashing, detachable tail to escape a predator’s grip.
Status
Least Concern — widespread across suitable Australian and New Guinean habitat, with only a few narrow-range species facing real pressure from habitat clearance.
Flap-footed Lizard: common questions
How can you tell a flap-footed lizard apart from a real snake?
The two most reliable physical differences are the eyes and ears. A flap-footed lizard has movable eyelids and can blink, just like typical lizards, while a true snake has a fixed, transparent scale permanently covering each eye and cannot blink at all. Flap-footed lizards also retain small external ear openings on the sides of the head, a lizard feature entirely absent in snakes, which have no visible outer ear structure whatsoever, making these two traits useful and dependable clues even though the overall long, legless body shape looks remarkably snake-like at first glance.
Why are they called flap-footed lizards if they don't really have legs?
The name refers to a small, flattened, flap-like remnant of a hind limb found on either side near the base of the tail, a vestigial structure that has no real function for locomotion but represents an evolutionary remnant of the fully developed back legs the family's ancestors once had. The front legs, by contrast, have been lost so completely that no external trace of them remains at all, making the tiny hind flaps essentially the family's last visible link to a four-legged ancestor.
Are flap-footed lizards closely related to snakes?
No, despite their long, legless, snake-like body shape, flap-footed lizards are true lizards and are considered close relatives of geckos, placed in their own family, Pygopodidae, within the broader gecko lineage rather than anywhere near true snakes on the reptile family tree. Their snake-like appearance is a striking example of convergent evolution, in which unrelated groups of animals independently evolve similar body shapes as effective solutions to a similar lifestyle, in this case a life spent moving through dense grass, leaf litter, or loose sand.
Can flap-footed lizards make sounds?
Yes, several species are capable of producing an audible squeak or chirp, particularly when handled or threatened, a trait inherited from their close relationship to geckos, many of which are also unusually vocal for lizards. This ability sets flap-footed lizards apart from the great majority of other lizard families, most of which are essentially silent and rely entirely on visual displays, body posture, or biting rather than sound to communicate or deter a threat.