Amphibians
Turtle Frog
Myobatrachus gouldii · also called turtle frog
The turtle frog looks exactly like its name — a small head, a round body, and four stubby legs, as though someone took a turtle and removed the shell. It digs head-first into the sand of southwestern Australia, in the wrong direction for a frog, and it eats little except termites.
Overview
Turtle frogs live in dry sandy country of southwestern Australia, wherever the soil is loose and termites are abundant. About 3.5–4.5 cm, with a spherical body and tiny head, they feed almost entirely on termites dug from underground.
Digging the wrong way
Most burrowing frogs back into the soil hind-feet-first. The turtle frog uses its shovel-like front limbs to dig head-first and forwards, like a mole or tortoise, straight into termite galleries.
No water, no tadpole
Females lay large eggs up to a metre deep in moist sand, where they develop directly into froglets — no tadpole stage, no pond needed.
Status
The turtle frog is Least Concern, widespread and locally common across suitable sandy habitat.
Turtle Frog: common questions
Why does the turtle frog look like a turtle?
The turtle frog's body plan, a small pointed head on a short neck, a stout, almost spherical trunk, and four very short, sturdy limbs, closely mirrors the outline of a turtle that has had its shell removed, which is exactly where the common name comes from. This shape is not a coincidence of appearance but a functional adaptation to a life spent digging through soil in pursuit of termites, since a compact, rounded body with powerful stubby limbs is efficient for pushing through sand, and the small head reduces resistance at the front. Several unrelated burrowing animals have converged on broadly similar proportions for the same reason.
How does the turtle frog dig, and why is that unusual?
The vast majority of burrowing frogs dig by backing into loose soil, using spade-like tubercles on their hind feet to shovel earth aside as they sink downward and disappear rear-first. The turtle frog does the opposite, using its strong, broad, muscular front limbs to dig head-first and forwards into the sand, more like a mole, a mole cricket, or a tortoise. This forward-digging style suits its feeding strategy, since it allows the frog to tunnel directly into termite nests and galleries, pushing through the soil toward its prey rather than simply hiding from the surface.
What does the turtle frog eat?
The turtle frog is a termite specialist, feeding almost entirely on termites that it digs out of their underground galleries and nests. When it breaks into a termite tunnel it can consume large numbers in a single sitting, with observations of individual frogs eating several hundred termites at one feeding, and this concentrated, high-density food source is well matched to the frog's burrowing lifestyle. Its narrow diet is one reason the species is tied to sandy country with abundant, healthy termite populations, and areas where termites have been reduced tend to support fewer turtle frogs.
How does the turtle frog reproduce without water?
The turtle frog has abandoned the typical frog life cycle entirely and does not need standing water to breed. After pairs form on the surface following autumn rains, the male clasps the female and the two may remain paired for months, moving underground together, and the following summer the female lays a small number of large, yolk-rich eggs in a chamber that can be up to a metre deep in moist sand. Each egg contains enough nutrition for the embryo to develop all the way into a fully formed miniature froglet inside the egg, a strategy called direct development, so no aquatic tadpole stage occurs and the young emerge from the nest ready to burrow and hunt termites like the adults.