Amphibians
Painted Frog
Discoglossus · also called painted frog
A painted frog is a modest, blotchy little frog of Mediterranean ditches and pools — but it belongs to an ancient branch of the frog family that never learned the basic frog trick of firing its tongue. And one of its close relatives pulled off something almost no animal manages: it came back from being officially extinct, and turned out to be a living fossil.
Overview
Painted frogs are the genus Discoglossus, small variably blotched frogs of Iberia, southern France, northwest Africa, and the western Mediterranean islands. They stay near shallow, often temporary water — ponds, ditches, springs, even brackish coastal pools — and hunt insects and other invertebrates at night.
A tongue that stays put
Painted frogs and their relatives the midwife toads have a disc-shaped tongue fixed to the floor of the mouth — it cannot be flipped out. To feed, the frog lunges bodily at prey and grabs it in its jaws, sometimes shoving it in with its hands. This and other old features mark the family (Alytidae, or Discoglossidae, “disc-tongue”) as a distinct early branch.
Back from extinction
The Israel painted frog of the Hula Valley was last seen in the 1950s after its marsh was drained, and declared extinct in 1996. In 2011 it was rediscovered during a wetland restoration — and its bones showed it belongs to Latonia, a genus otherwise known only from fossils millions of years old. A living fossil, hiding.
Status
Least Concern for the mainland Discoglossus painted frogs, which are common and adaptable. The rediscovered Latonia painted frog is Critically Endangered, confined to a tiny patch of restored Israeli wetland.
Painted Frog: common questions
Why can't a painted frog stick out its tongue?
Because of how the tongue is built. In most frogs the tongue is attached at the front of the mouth and folded back, so it can be flipped forward like a party blower to snag prey. In painted frogs and their relatives the tongue is a rounded disc anchored across the floor of the mouth and cannot be projected at all. To feed, the frog has to move its whole body, lunging at prey and grabbing it with a snap of the jaws, occasionally using its front feet to stuff a struggling insect in. It is one of the features that marks the family as an old, distinct branch of the frog tree.
What is the Israel painted frog, and how was it rediscovered?
It is a frog from the marshes of the Hula Valley in northern Israel that was known from only a handful of specimens, was last recorded in the 1950s after most of the valley was drained for farming, and was formally declared extinct in 1996. In 2011, as part of a project to restore a small area of the wetland, a ranger caught one, and further searches found more. Analysis of its skeleton then revealed something remarkable, in that it is not a close relative of the living painted frogs but a member of Latonia, a genus previously known only from fossils, so it is a true living fossil that had survived unnoticed.
Are painted frogs the same as poison dart frogs?
No, they are not related and the resemblance is only in the name and the bold markings. Painted frogs are plain-toned European and North African frogs of the family Alytidae, they are not toxic in any significant way, and they get their name from their blotchy, varied colour pattern. Poison dart frogs are small, often brilliantly coloured, genuinely toxic frogs of Central and South American rainforests in a completely different family. The two live on different continents and are only superficially alike.
Where would I see a painted frog?
Around shallow water in the warmer parts of southwestern Europe and northwest Africa. Painted frogs like small, sunny, often temporary or disturbed water bodies, such as garden ponds, cattle troughs, irrigation ditches, spring pools, wheel ruts, and quiet stream edges, including some that are slightly salty near the coast. They are mostly nocturnal, are quick to dive and hide, and have only a faint call, so they are usually found by turning stones and debris at the water's edge or by spotting one at night with a torch, rather than heard.