Amazon Milk Frog (Trachycephalus resinifictrix) Care Sheet
The Amazon Milk Frog is a large, striking arboreal amphibian native to the Amazon Basin of South America. Trachycephalus resinifictrix is characterised by its contrasting grey, brown and cream patterning, prominent toe pads and distinctive golden eyes.
The common name “Milk Frog” refers to the milky defensive secretion that may be produced when the animal is stressed or threatened.
Although relatively robust once established, Amazon Milk Frogs require appropriate vertical accommodation, good ventilation, clean water, carefully managed humidity, varied nutrition and minimal handling.
QUICK REFERENCE
Scientific Name: Trachycephalus resinifictrix
Common Names: Amazon Milk Frog, Mission Golden-Eyed Tree Frog
Family: Hylidae
Origin: Amazon Basin, South America
Adult Size: Approximately 6–10 cm, with females generally larger than males
Lifespan: Commonly 8–10+ years in captivity, potentially longer with excellent care
Activity: Nocturnal
Lifestyle: Arboreal
Diet: Insectivorous / opportunistic carnivore
Care Level: Intermediate
NATURAL HISTORY
Trachycephalus resinifictrix occurs within the Amazon Basin of South America.
Its distribution includes areas of:
- Brazil
- Colombia
- Ecuador
- Peru
- Bolivia
- The Guianas
Amazon Milk Frogs are strongly arboreal and are associated primarily with humid tropical forest.
Adults spend much of their lives above ground in:
- Tree canopies
- Branches
- Tree hollows
- Vegetation
They are particularly associated with water-filled tree cavities, which can play an important role in breeding.
During daylight, frogs generally remain concealed in sheltered locations.
Activity increases after dark when they emerge to hunt and move through the surrounding vegetation.
APPEARANCE
Young Amazon Milk Frogs often display particularly strong contrasting black or dark brown and white banding.
The colour typically becomes more muted with age.
Adults commonly develop:
- Grey
- Brown
- Cream
- White
patterning.
The skin has a slightly granular appearance, and the toes terminate in large adhesive pads adapted for climbing.
The eyes are particularly distinctive, with a golden or bronze iris containing a dark cross-like pattern.
DEFENSIVE SECRETION
When significantly stressed or threatened, Amazon Milk Frogs can produce a sticky, milky defensive skin secretion.
This is the origin of their common name.
The secretion is intended to discourage predators and may irritate:
- Eyes
- Mouth
- Nose
- Other mucous membranes
It should not be deliberately induced.
Routine handling should therefore be avoided both for the frog’s welfare and to minimise unnecessary exposure to defensive secretions.
ENCLOSURE
Amazon Milk Frogs require a vertically orientated enclosure that provides substantial climbing space.
For a pair or small group of adults, approximately:
60 × 45 × 90 cm (24 × 18 × 36 in)
provides a useful minimum starting point.
Larger accommodation is strongly encouraged.
The enclosure should provide:
- Substantial vertical structure
- Numerous climbing routes
- Large resting surfaces
- Dense foliage
- Secure elevated hides
- Shaded areas
- Good ventilation
- Access to clean water
Usable climbing structure is more important than empty enclosure height.
ENCLOSURE TYPE
Front-opening glass terrariums and appropriately constructed arboreal vivariums work particularly well.
The enclosure must be secure.
Amazon Milk Frogs possess large adhesive toe pads and can climb:
- Glass
- Plants
- Branches
- Backgrounds
- Enclosure furnishings
Good ventilation is essential.
The enclosure should not remain permanently sealed, stagnant and saturated.
Cross-ventilation or a combination of lower and upper ventilation can provide useful air exchange.
SUBSTRATE
Suitable substrates include:
- Organic topsoil
- Coco-based substrate
- Amphibian-safe soil mixtures
- Leaf litter
- Bioactive substrate systems
A drainage layer can be useful in planted enclosures.
Substrate should remain moderately moist without becoming permanently waterlogged.
A substantial layer of leaf litter can help:
- Retain moisture
- Protect the underlying substrate
- Support naturalistic microfauna
- Provide environmental complexity
Avoid:
- Gravel
- Calcium sand
- Fertilised soil
- Chemically treated substrate
- Sharp materials
- Aromatic wood products
CLIMBING STRUCTURE
Amazon Milk Frogs are powerful arboreal frogs and require substantial climbing structures.
Suitable furnishings include:
- Cork bark
- Cork tubes
- Natural branches
- Vines
- Bamboo
- Large pieces of wood
- Elevated platforms
Provide branches at:
- Horizontal angles
- Diagonal angles
- Different heights
- Different diameters
All furnishings must be securely positioned.
PLANTING
Live planting is particularly suitable for Amazon Milk Frogs.
Robust plants can provide:
- Shade
- Visual barriers
- Resting surfaces
- Humidity retention
- Naturalistic cover
Broad-leaved and sturdy plants are particularly useful.
Plants must be:
- Non-toxic
- Free from pesticides
- Appropriately cleaned before introduction
Dense planting should not completely eliminate airflow.
ARBOREAL HIDES
Amazon Milk Frogs naturally use elevated cavities and sheltered arboreal locations.
Providing elevated hides can therefore be particularly valuable.
Suitable options include:
- Cork tubes
- Hollow branches
- Purpose-made arboreal hides
- Appropriately positioned bamboo sections
Where safe and practical, elevated water-containing cavities can provide additional naturalistic enrichment.
Any such feature must be designed so that it can be inspected and maintained hygienically.
TEMPERATURE
Amazon Milk Frogs require warm tropical conditions without excessive heat.
Daytime
A useful general ambient range is approximately:
23–27°C (73–81°F)
A slightly warmer upper area may reach approximately:
27–29°C (81–84°F)
provided cooler areas remain available.
Night
Temperatures may fall moderately overnight.
Approximately:
20–23°C (68–73°F)
is generally suitable.
HEATING
Where supplementary heating is necessary, overhead heating is generally preferable.
Any heat source must be controlled using an appropriate thermostat.
Heating should establish a gentle gradient rather than warming the entire enclosure uniformly.
The frogs must always be able to move away from the heat source.
OVERHEATING
Prolonged excessive temperatures should be avoided.
Temperatures approaching or exceeding:
30°C (86°F)
can become problematic, particularly when combined with inadequate ventilation or dehydration.
Never position the enclosure where direct sunlight can cause uncontrolled heating.
HUMIDITY
Amazon Milk Frogs originate from humid tropical environments, but captive enclosures should not remain permanently saturated.
A useful general relative humidity range is approximately:
60–80%
with temporary increases following misting.
Humidity should fluctuate naturally.
The enclosure can become considerably more humid after misting before gradually drying as ventilation removes excess moisture.
A wet-to-drier cycle is preferable to maintaining constantly extreme humidity.
MISTING
Misting provides drinking opportunities and helps reproduce natural fluctuations in environmental moisture.
Misting is particularly useful during the evening as frogs become active.
Water droplets should form on:
- Leaves
- Branches
- Glass
- Other surfaces
The enclosure should then be allowed to partially dry.
Automatic misting systems can be useful but are not essential.
Avoid continuously saturated surfaces.
WATER
A large container of clean amphibian-safe water should always be available.
Amazon Milk Frogs may soak regularly, particularly at night.
The water container should be:
- Easy to enter
- Easy to leave
- Large enough for the frogs to soak
- Regularly cleaned
Water should be checked daily and replaced whenever contaminated.
Use appropriately treated amphibian-safe water.
WATER QUALITY
Amphibians possess highly permeable skin and can be sensitive to poor water quality.
Water should be free from harmful concentrations of:
- Chlorine
- Chloramine
- Ammonia
- Nitrite
- Other contaminants
Appropriately conditioned tap water may be suitable depending upon local water chemistry.
Never assume visually clear water is necessarily chemically appropriate.
LIGHTING
Provide a clear day/night cycle.
Approximately:
10–12 hours of daylight
per day is appropriate for routine maintenance.
Good-quality LED lighting can support:
- Natural behavioural rhythms
- Live plant growth
- Normal environmental cues
Dense foliage and hides should provide shaded daytime resting locations.
UVB
Low-level UVB is recommended as part of high-quality captive husbandry.
A Ferguson Zone 1-type exposure is appropriate.
Aim for approximately:
UVI 0.5–1.0 in exposed accessible areas
with:
UVI 0 available beneath cover
The frogs must always be able to regulate their exposure.
Actual UV exposure depends upon:
- Lamp type
- Reflector
- Distance
- Mesh
- Enclosure height
- Plant cover
- Furnishings
Where possible, exposure should be confirmed using an appropriate UV Index meter.
DIET
Amazon Milk Frogs are opportunistic insectivorous predators.
Captive diets should be based around varied, appropriately sized invertebrate prey.
Suitable foods include:
- Crickets
- Locusts
- Cockroaches
- Earthworms
- Flies
- Appropriate larvae
- Other nutritionally suitable feeder invertebrates
Dietary variety is strongly encouraged.
Reliance upon a single feeder species should be avoided.
Wild-caught insects should generally not be used because of possible:
- Pesticide exposure
- Parasites
- Disease transmission
- Environmental contamination
PREY SIZE
Offer appropriately sized prey.
Amazon Milk Frogs possess large mouths and strong feeding responses.
Their willingness to attempt to consume an item does not necessarily mean that it is suitable.
Avoid excessively large prey that may:
- Cause injury
- Be difficult to swallow
- Create digestive problems
Uneaten feeder insects should be removed where necessary.
FEEDING FREQUENCY
Feeding frequency depends upon:
- Age
- Size
- Body condition
- Temperature
- Activity
- Prey size
Juveniles
Growing juveniles can generally be offered appropriately sized prey:
Daily or near-daily
with quantity adjusted according to growth and body condition.
Adults
Healthy adults can generally be fed:
Approximately 2–3 times per week
with quantities adjusted according to individual body condition.
Feeding after lights-out corresponds well with their natural nocturnal activity.
SUPPLEMENTATION
Cultured feeder insects should be appropriately gut-loaded and supplemented.
A suitable supplementation programme should provide:
- Calcium
- Vitamin D3 where appropriate
- Vitamin A
- Other essential vitamins and minerals
Requirements depend upon:
- Frog age
- Diet
- Feeding frequency
- UVB provision
- Reproductive status
- Supplement formulation
Follow the manufacturer’s recommendations for the particular amphibian-appropriate supplement being used.
VITAMIN A
Vitamin A is an important consideration in captive amphibian nutrition.
Deficiency may contribute to abnormalities involving:
- Feeding
- Eyes
- Skin
- Growth
- Reproduction
- Normal epithelial function
A reputable amphibian supplementation programme should provide an appropriate source of vitamin A.
Plain calcium alone does not provide a complete supplementation programme.
BODY CONDITION
Amazon Milk Frogs can develop excessive body condition if consistently overfed.
Monitor:
- Overall body shape
- Weight
- Activity
- Mobility
- Feeding frequency
Adult feeding should be adjusted according to body condition rather than appetite alone.
SOCIAL HOUSING
Amazon Milk Frogs can often be maintained successfully in appropriately sized groups.
Animals housed together should be reasonably similar in size.
The enclosure must provide sufficient:
- Space
- Perches
- Hides
- Feeding opportunities
- Visual barriers
Significant size differences should be avoided.
Large frogs may attempt to consume substantially smaller individuals.
Group housing requires careful monitoring to ensure every frog is feeding and maintaining appropriate body condition.
HANDLING
Amazon Milk Frogs should primarily be considered display animals.
Routine handling is unnecessary.
In addition to the permeability and sensitivity of amphibian skin, this species can produce defensive skin secretions when stressed.
When handling is genuinely necessary, clean powder-free nitrile gloves moistened with amphibian-safe water are recommended.
Avoid contact between defensive secretions and:
- Eyes
- Mouth
- Nose
- Open wounds
Handling should remain brief and gentle.
BEHAVIOUR
Amazon Milk Frogs are primarily nocturnal.
During daylight they commonly remain concealed:
- Inside tree-hole-type retreats
- Behind cork bark
- Among dense foliage
- Within elevated hides
After dark they become substantially more active and may:
- Climb throughout the enclosure
- Hunt prey
- Visit water
- Move between resting locations
- Vocalise
A healthy frog remaining concealed during daylight is therefore normal behaviour.
VOCALISATION
Males can produce loud calls, particularly during breeding activity.
Calling generally increases:
- At night
- Following misting
- During humid conditions
- During reproductive activity
Potential keepers should consider nighttime vocalisation when deciding where the enclosure will be positioned.
BREEDING
Amazon Milk Frogs have an unusual reproductive ecology closely associated with water-filled tree cavities.
In the wild, males may call from suitable water-containing tree holes.
Females deposit eggs in water, where the larvae subsequently develop.
Captive breeding usually involves deliberate conditioning and the provision of suitable aquatic breeding sites.
Successful breeding requires planning for:
- Adult conditioning
- Egg management
- Tadpole accommodation
- Water quality
- Tadpole nutrition
- Metamorphosis
- Juvenile housing
Breeding should not be attempted without appropriate long-term accommodation for resulting offspring.
TADPOLES
Tadpoles are entirely aquatic.
They require:
- Clean water
- Stable water chemistry
- Appropriate temperatures
- Suitable nutrition
- Adequate space
- Good water quality
As metamorphosis approaches, developing froglets must have easy access to suitable surfaces above the water.
Metamorphosing animals require careful monitoring as their environmental and dietary requirements change rapidly.
ENRICHMENT
Amazon Milk Frogs benefit from a structurally complex arboreal environment.
Useful enrichment includes:
- Multiple climbing routes
- Different branch diameters
- Elevated hides
- Tree-hole-type retreats
- Dense foliage
- Open hunting areas
- Variable heights
- Varied appropriate live prey
The enclosure should allow frogs to choose between:
- Higher and lower positions
- Warmer and cooler areas
- Exposed and sheltered locations
- Wetter and relatively drier areas
- Different light intensities
Providing environmental choice encourages natural behaviour.
CLEANING & MAINTENANCE
Regular maintenance should include:
- Removing faeces
- Removing uneaten feeder insects
- Replacing contaminated water
- Cleaning the water container
- Removing decaying plant material
- Checking substrate condition
- Inspecting plants
- Checking drainage
- Checking ventilation
- Inspecting enclosure security
Any elevated water-containing hides should also be regularly inspected and maintained.
Avoid unnecessarily sterilising a healthy established bioactive enclosure.
Any cleaning products used must be amphibian-safe and thoroughly removed before frogs contact treated surfaces.
BIOSECURITY
Good biosecurity should be maintained between amphibian enclosures.
Equipment should ideally not be shared between unrelated amphibians.
Where equipment must be reused, it should be appropriately cleaned and disinfected.
Hands should be washed before and after enclosure maintenance.
Never release:
- Frogs
- Tadpoles
- Eggs
- Plants
- Substrate
- Enclosure water
- Biological material
into the natural environment.
QUARANTINE
New Amazon Milk Frogs should undergo an appropriate quarantine period before entering an established collection.
Monitor:
- Appetite
- Weight
- Body condition
- Activity
- Skin condition
- Faeces
- Hydration
- General behaviour
Separate equipment should ideally be used for quarantined amphibians.
Veterinary assessment and appropriate diagnostic testing should be considered where health concerns exist.
HEALTH
Potential health problems include:
- Dehydration
- Bacterial infections
- Fungal infections
- Parasitic disease
- Nutritional deficiencies
- Metabolic bone disease
- Obesity
- Skin damage
- Trauma
Warning signs include:
- Persistent refusal to feed
- Unexplained weight loss
- Excessive weight gain
- Weakness
- Difficulty climbing
- Abnormal posture
- Skin discolouration
- Redness
- Swelling
- Skin lesions
- Persistent abnormal behaviour
Persistent or serious health concerns should be assessed by a suitably experienced exotic or amphibian veterinarian.
LONG-TERM CONSIDERATIONS
Amazon Milk Frogs are impressive display amphibians but require considerably more than a simple humid terrarium.
Potential keepers should consider:
- Adult enclosure size
- Vertical climbing requirements
- Long-term temperature management
- Humidity and ventilation
- Clean water
- Lighting and UVB
- Supplementation
- Veterinary access
- Potential nighttime vocalisation
- Minimal handling requirements
Their large adult size and arboreal behaviour make a spacious, well-planted vertical enclosure particularly important.
A properly designed environment allowing natural climbing, hiding, hunting and nocturnal activity provides the best opportunity for successful long-term maintenance.
IMPORTANT INFORMATION
This care sheet provides general husbandry guidance and does not replace species-specific research or veterinary advice. Individual requirements may vary.
Amazon Milk Frogs (Trachycephalus resinifictrix) can produce a defensive skin secretion when stressed. Avoid contact with the eyes, mouth and other mucous membranes, and keep handling to a minimum.
If you have concerns about an animal’s health or care, consult a suitably experienced exotic or amphibian veterinarian.
Information correct at the date of publication.
ReptileCommunity.com | Revised: August 2026