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Amphibians · Java · Bali

Muller's Narrowmouth Frog

Muller's Narrowmouth Frog (Kaloula baleata). Müller's narrowmouth frog is a microhylid with a rounded body; skin condition and age can change its appearance.

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Photograph of Muller's Narrowmouth Frog (Kaloula baleata).
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Quick answer

IUCN status: Least Concern

Muller's Narrowmouth Frog at a glance

Muller's Narrowmouth Frog (Kaloula baleata) is an amphibian in the family Microhylidae. In Indonesia, observation records come mainly from West Java, Yogyakarta, Bali. Diet: insect- and small-invertebrate-eater (insectivore); a carnivore. IUCN Red List status: Least Concern.

Quick facts: Muller's Narrowmouth Frog
Scientific nameKaloula baleata
Indonesian nameBelentuk-pohon jawa
GroupAmphibians
FamilyMicrohylidae
Observation recordsWest Java, Yogyakarta, Bali
Taxonomic groupAnura
GBIF records419 human-observation records, 2016–2026
Data retrieved2026-09-23
IUCN statusLeast Concern · IUCN Red List (via GBIF) · checked 1 October 2026
Diet typeCarnivore (meat-eater) — insect- and small-invertebrate-eater (insectivore) · Australian Museum
ReproductionLaying eggs (oviparous) · Australian Museum
ActiveNocturnal (active at night) — In the late dry season it mostly stays in its burrow. · Auffenberg, W. (1980) The herpetofauna of Komodo, with notes on adjacent areas. Bulletin of the Florida State Museum, Biological Sciences 25(2): 39-156
In this guide (12)
About this guideThis guide was compiled from the listed species sources and observation records; it has not been reviewed by a taxonomic specialist. GBIF records are neither a census nor proof of native range.

What is the Muller's Narrowmouth Frog?

Muller's Narrowmouth Frog refers to Kaloula baleata, in the genus Kaloula, family Microhylidae, and order Anura. The scientific name follows the accepted taxon in the GBIF Backbone Taxonomy. Common names can vary between places; the scientific name distinguishes this species from relatives.

Evidence: GBIF Backbone Taxonomy — accepted taxon ↗

What is known about the Muller's Narrowmouth Frog?

Müller's narrowmouth frog is a microhylid with a rounded body; skin condition and age can change its appearance.

Read that fact alongside the scientific name and species source, not as proof from an unclear photograph. Populations, ages and taxonomic limits can differ; when identification is uncertain, record the broader group.

Evidence: Species account — background reading ↗

How many Indonesian records name the Muller's Narrowmouth Frog?

When checked on 2026-09-23, the GBIF search returned 419 human-observation records from Indonesia under this species name for 2016–2026. That is a count of indexed records, not an estimate of population, abundance or unique individuals. Observation effort can vary by location, and the count may change as records are added or identifications revised.

Evidence: GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗

Where were observations reported?

Place labels appearing in the results include West Java, Yogyakarta, Bali. They are labels attached to records, not a complete range map or evidence that the species occurs only there. Some labels may be broad or inconsistent. Check the underlying records before using the location information for field decisions.

Evidence: GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗

How can you observe the Muller's Narrowmouth Frog?

Observe in place without moving eggs, tadpoles or frogs. Images of the body and habitat, together with date and calls, can help specialists assess an identification; common names do not establish handling safety. A well-documented sighting helps others check the identification without turning one encounter into a conservation-status claim.

Explore related animals

To explore this group further, compare Muller's Narrowmouth Frog with Hasselt's Toad, Asian Common Toad, Common Southeast Asian Tree Frog. These links reflect a shared genus, family, order, class or catalogue group; taxonomic proximity does not imply identical habitat needs or conservation status.

Scientific classification of the Muller's Narrowmouth Frog

Scientific classification from kingdom to species
KingdomAnimalia
PhylumChordata
ClassAmphibia
OrderAnura
FamilyMicrohylidae
GenusKaloula
SpeciesKaloula baleata

Source: GBIF Backbone Taxonomy, adjusted to the ranks commonly used in school biology (for example class Reptilia).

Common questions about Muller's Narrowmouth Frog

What is the scientific name of Muller's Narrowmouth Frog?

The scientific name of Muller's Narrowmouth Frog is Kaloula baleata, in the family Microhylidae and the order Anura. In Indonesian it is called Belentuk-pohon jawa.

What kind of animal is Muller's Narrowmouth Frog?

Muller's Narrowmouth Frog is an amphibian in the family Microhylidae. By diet it is a carnivore (meat-eater): a insect- and small-invertebrate-eater (insectivore).

Where does Muller's Narrowmouth Frog live in Indonesia?

Observation records of Muller's Narrowmouth Frog summarised in this guide mainly come from West Java, Yogyakarta, Bali. That list is not a complete range map.

What does Muller's Narrowmouth Frog eat?

Muller's Narrowmouth Frog is a insect- and small-invertebrate-eater (insectivore). That makes it a carnivore (meat-eater). Source: Australian Museum.

How does Muller's Narrowmouth Frog reproduce?

Muller's Narrowmouth Frog reproduces by laying eggs (oviparous). Source: Australian Museum.

Is Muller's Narrowmouth Frog nocturnal?

The cited source records Muller's Narrowmouth Frog as nocturnal (active at night). In the late dry season it mostly stays in its burrow. Source: Auffenberg, W. (1980) The herpetofauna of Komodo, with notes on adjacent areas. Bulletin of the Florida State Museum, Biological Sciences 25(2): 39-156.

See also the list of nocturnal and diurnal animals in Indonesia.

What is the scientific classification of Muller's Narrowmouth Frog?

Scientific classification of Muller's Narrowmouth Frog: kingdom Animalia, phylum Chordata, class Amphibia, order Anura, family Microhylidae, genus Kaloula, species Kaloula baleata.

Source: GBIF Backbone Taxonomy, adjusted to the ranks commonly used in school biology.

Is Muller's Narrowmouth Frog endangered?

No, according to the global IUCN assessment. On the IUCN Red List, Muller's Narrowmouth Frog is listed as Least Concern: it does not qualify for a threatened category or for Near Threatened in the global assessment. Source: IUCN Red List (via GBIF), checked 1 October 2026.

This global category is separate from legal protection in Indonesia. To check whether Muller's Narrowmouth Frog is a protected species, consult the current national list of protected species or contact the local BKSDA (natural resources conservation office).

Sources & references

  1. GBIF Backbone Taxonomy — accepted taxon ↗
  2. GBIF occurrence search — Indonesia, human observations, 2016–2026 ↗
  3. iNaturalist — exact species taxon and community observations ↗
  4. Species account — background reading ↗
  5. Australian Museum ↗
  6. Auffenberg, W. (1980) The herpetofauna of Komodo, with notes on adjacent areas. Bulletin of the Florida State Museum, Biological Sciences 25(2): 39-156 ↗
  7. GBIF Backbone Taxonomy (GBIF) ↗
  8. IUCN Red List of Threatened Species, version 2026-1, via GBIF (CC BY 4.0) ↗

References can change. Check dates and context in the original source. How we use sources and data →

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Credit PanduanHewan when referring to this page. Check the original evidence sources before reusing a claim.

PanduanHewan. Muller's Narrowmouth Frog (Kaloula baleata). Last substantive update: 1 October 2026. https://panduanhewan.org/en/species/kaloula-baleata/

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