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Ranitomeya sirensis 'Highland' (Captive Bred) - Pasco Poison Frog

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5.0 out of 5 stars


About This Product

Defining Characteristics:

  • Great group thumbnail
  • Bright, yellow and black coloration
  • Shy
  • Moderately difficult to breed
  • Quiet call
  • HUGE (for a thumbnail)
  • Rare

Name: Ranitomeya sirensis 'Highland'. Formerly known as Dendrobates lamasi, this frog is commonly known as the Pasco Poison Dart Frog due to it's range in the wild. Recent taxonomic revision reclassifies lamasi as R. sirensis. Commonly called Standard lamasi or Standard sirensis in the hobby, these frogs were once common and now quite rare.

Recommended Vivarium Size: A 10 gallon aquarium is suitable for 2-3 Ranitomeya sirensis, but Josh's Frogs recommends a 20H or 18x18x18 Vivarium for 1-3 frogs. These are larger thumbnail frogs that do great in groups - consider a large vivarium. Not sure how to set up a vivarium? Please watch our video on How to Set Up a Vivarium.

Temperature: They can tolerate a temperature range of 65 F to 80 F, but prefer temperatures in the low 70s. Temperatures over 85F are dangerous. Many hobbyists (us included!) report better breeding success with temp drops of 5-10F at night.

Humidity: Like most poison dart frogs, lamasi prefer a humidity range of 80 – 100%, but can tolerate humidity down to 50% for short periods of time if the frogs have access to water. Low humidity levels, especially without access to water, can quickly be fatal.

Size: Adult female and male R. sirensis 'Highland' are similar in length, measuring in at around an inch to 1.25". Males tend to be a bit shorter. All of the Ranitomeya sirensis 'Highland' froglets Josh's Frogs sells are well started juveniles, and measure at least 1/2” long.

Age: Ranitomeya sirensis 'Highland' is capable of living well over 10 years in captivity under ideal conditions, although a lifespan of 5-8 years is more common. All lamasi for sale at Josh's Frogs are well started juveniles, and are 2-3 months old.

Feeding: Like most poison dart frogs, lamasi prefer smaller foods. All of the thumbnail dart frogs sold by Josh's Frogs will readily eat Drosophila melanogaster fruit flies. Adult Ranitomeya sirensis will readily consume Drosophila hydei fruit flies and pinhead crickets. All ages of poison dart frogs will enjoy springtails and isopods. All feeder insects should be dusted with a vitamin/mineral supplement. For more information on what poison dart frogs can eat, please visit our How-To Guide on Feeding Poison Dart Frogs.

Sexing: Ranitomeya sirensis 'Highland' are fairly easy to sex as adults. Females are much longer looking than males, as they lay eggs frequently. Josh's Frogs sells 2-3 month old juveniles that are not sexable unless otherwise noted. For more information on sexing poison dart frogs, please visit our How-To Guide on Sexing Poison Dart Frogs.

Color/Pattern: Standard lamasi are fairly consistent in color and pattern. Exhibiting a black and yellow striped body with blue and black legs, they are a striking little thumbnaill dart frog! Josh's Frogs does not recommend, support, or endorse line breeding as we believe this leads to weaker captive animals and nature has done a wonderful job of creating an amazing variation in color and pattern of poison dart frogs already.

Social Behavior: These frogs do well housed in groups their entire life as long as enough space is provided. Josh's Frogs recommends approximately 10 gallons per frog. As they reach sexual maturity at 5-8 months of age, the social dynamic in a group of lamasi dart frogs may change and females may eat each other's eggs, although most will even breed together in the same film canister! Josh's Frogs strongly recommends against housing different species/morphs of dart frogs - for the health of your pets, please avoid mixing! Josh's Frogs recommends purchasing multiple frogs if you are interested in breeding them – this greatly increases the chances of getting a pair.

Breeding: Lamasi are one of the easiest poison dart frogs to breed, but Highland Sirensis have proven difficult to produce consistently. Best bred in groups, males call to attract a female to a suitable egg laying site. Then, 2-4 eggs are laid on a smooth surface (often in a film canister or a bromeliad). The eggs hatch into tadpoles, which then take 60-80 days to complete metamorphosis into miniature versions of the adults. Tadpoles will feed on dead fruit flies, the standard frog and tadpole bites/sera micron fare, and even unfertilized eggs if left in with the adults! For more information on breeding and raising poison dart frogs, please visit our How-To Guide on Breeding Poison Dart Frogs.

Natural Range: Ranitomeya sirensis 'highland' hails from the highlands of Peru, where it was once common in disturbed habitat or secondart forest. Now, it's very possible this morph of sirensis/lamasi is no longer present in the wild, at least in large numbers, due to overcollecting.

History in the Hobby: This thumbnail entered the hobby long ago, and was once regularly available. Now, it is quite rare!

Links of Interest:

Pasco Poison Dart Frog - Wikipedia

DendroBase article on R. lamasi

Ranitomeya lamasi caresheet on Dendroboard

Josh's Frogs Blog on Thumbnail Dart Frogs

Still not sure if Ranitomeya sirensis 'Highland' from Josh's Frogs are the right poison dart frog for you? Read the reviews below and see what other customers are saying!


After placing an order containing a live animal, you will receive a scheduling email containing our JotForm scheduling link to schedule your new pet's delivery date.

With this scheduling link, you will be able to schedule your order's delivery up to 30 days in advance. You will be able to choose a date of delivery for Tuesday-Saturday (Saturday arrival depends on the carrier's service availability) with the estimated time of arrival generally being 12pm, or 4:30pm for more rural areas. Overnight lows must be above 40°F to ship directly to you (or above 30°F for FedEx Ship Center pickups) as well as below 90°F by estimated time of arrival.

If you require further assistance, or prefer to talk to one of our Customer Service agents, please feel free to reach out to our [email protected] email or our phone line 1-800-691-8178.

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5.0 out of 5 stars

Based on 6 reviews

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5.0 out of 5 stars

he's lit

sooooooooooooooooooooooooooooooooooooooooooooo awesome


5.0 out of 5 stars

Amazing size

All 7 came in a lot larger than I was expecting and all were healthy and robust...simply beautiful. Josh's Frogs and Zach and the crew are simply amazing and I will continue to be a loyal customer! David


5.0 out of 5 stars

Beautiful and fun frogs

Got 3 of these frogs shipped and they arrived in perfect health. They are beautiful, already rather large and one of them has already started calling! They are more bold than I anticipated and have fun personalities. They roam around in the morning and sleep up high at night. Thanks for the wonderful frogs


5.0 out of 5 stars

Amazing frogs

I picked up 6 of these beautiful frogs last weekend at the show here in Mesa, AZ. No tiny froglets here, these are big healthy subadults. I have been surprised by how bold they have been so far compared to other thumbs I have kept. These guys seem to do great in groups. I am very happy with my purchase. Josh and Zach are great guys who really know what they are doing! Lance

Registered flex offender

5.0 out of 5 stars

Quality frog man

Wasn't expecting that much out of this experience. I've had many a frog in my day, and ill say that this one has to peak to the very top to my collection of an exotic frog. Vibrant color, along with a humorous personality. We have really bonded, but it kind of hurts when I try to breastfeed him(only joking, it doesn't hurt when I breastfeed him). Overall 10/10 frog, but an 11/10 lover.

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