Ranitomeya vanzolinii
Intro
Ranitomeya vanzolinii (pronounced Ran-it-oh-may-ah van-zoh-lee-nee) are black and yellow frogs with blue legs. Being a Ranitomeya frog, vanzolinii are small. These little fellas are quick and can be a bit on the shy side, but may warm up to you if you visit them through the glass a lot. They are diurnal like all Ranitomeya, so you won’t have to get up late to watch them. They should be active when you are! These are very small but easy to care for and make a great beginner frog with adequate preparation.
Quick Stats:
Enclosure: 30cmX30cmX45cm (12”X12”X18”)
Heat: 18°C-27°C (65°F-80°F)
Humidity: 70-100%
Food: Juveniles D. melanogaster, Adults may take D. hydei, small isopods, springtails.
Lifespan: Approximately 10+ years
Description
Vanzolinii frogs are not too variable in their coloring. These frogs are black headed and bodied, with hot yellow polka dots or ovals. Their legs are baby blue with black spotting and blotching. This can vary somewhat in each individual frog. On the smaller size for a Ranitomeya, big females measure in at about 17mm, and males are typically slightly smaller. Females are often rounder than males. Vanzolinii frogs share the common pearlescence of the Ranitomeya genus.
Distribution and Natural Habitat
Vanzolinii are native to Peru, in the Amazon basin. These frogs prefer to be off the ground and can be found living in bromeliads and leaves in the in the tropical rainforest. However, they like to lay their eggs in the leaf litter on the ground. Vanzolinii is considered by the IUCN Red List as “Least Concern”, making vanzolinii stable in the wild and fairly common to spot within their geographic range.
Behavior
Like all Ranitomeya, the vanzolinii frogs are diurnal meaning they are awake during the day. They are arboreal and live in the low hanging leaves of the jungles they inhabit. In the wild they are constantly foraging for small insects, invertebrates and arthropods on and around their plants. Some of the plants in the jungles contain various alkaloids and toxins, the micro fauna eat these plants and in turn get eaten by the frogs. This causes a downstream effect and these amazing frogs have evolved to harness the toxins as a means of self-defense. A combination of their striking colors and the toxins stored in their glands help ward off potential predators. In captivity the vanzolinii do not contain any of these toxins due to the diet provided to them. They don’t have access to the food they would be eating in the wild. vanzolinii live near streams and ponds, or right on the edge of slow moving water. While being frogs they are not very good swimmers and great care should be taken when making a suitable vivarium for them to live in. Once mature, the males will boldly perch in the open and call out to attract females. The vanzolinii call is loud. It sounds like a short, loud “buzz buzz” or “chirp chirp.” When a female selects a male, the pair will hop away to a nice quiet place, often in a bromeliad, and mate. For most vanzolinii the adult frogs are not aggressive and a mixed group can be kept in an appropriate sized vivarium. Be aware that this may change with individual frogs.
Life in the Vivarium
Like all dart frogs, vanzolinii require a humidity range of 70-100%. They can survive for brief intervals at 50% humidity if clean water is provided for them to soak in. You can place a bromeliad or small shallow dish of water in the enclosure or add a pond feature to achieve this. Remember, vanzolinii cannot swim well, so ensure that the water source is shallow and easy to get out of. The water level should be no higher than the smallest frog can sit in with his head and upper torso out.
Vanzolinii thrive at temperatures near 21°C (70°F) but can survive a range of 18°C-27°C (65°F-80°F). Never exceed 29°C (85°F) as this can be fatal to the frogs. Generally a heat source such as a pad or light is not needed on a dart frog vivarium, apart from any lighting for plants. Do not rely on sunshine from a window, because the sun through the glass will heat up to extremely unsafe temperatures very quickly. Keep note of any air conditioning or heaters used in your home as well, as they may affect the temperature in your frog cage.
It is possible to house a single vanzolinii in a 7 gallon aquarium. We recommend a 30cmX30cmX45cm (12”X12”X18”) enclosure – but bigger is always better. This size vivarium is suitable to house 2-3 adult vanzolinii.
As juveniles you can house several vanzolinii together, and as adults they get along well, though have been shown to be monogamous. In our experience vanzolinii can be housed in mixed groups, but if any fighting is observed you will be required to remove the offending frog. The size of the vivarium provided and the individual personalities of each animal will dictate how many frogs you can keep in an enclosure. It is common to keep a pair or trio of frogs in one enclosure. If you want to keep a group, add at least 1 gallon of space per additional frog.
It is common for a healthy Ranitomeya to live to 10+ years in a vivarium. Please consider this before deciding to take them home to your family. As with most amphibians they are considered a “hands off” pet similar to a fish. Due to their delicate and permeable skin, it is not advised to handle your frogs. The chemicals, oils and debris on your hands could prove fatal to your dart frog pet when it is absorbed through their skin. It is recommended that you wear powder free rubber gloves if you are required to handle your dart frogs. In an emergency, such as an escape from the enclosure, try to capture them as fast as possible (bare hands will do… if needed) as they will try to hide quickly, and unfortunately this will become fatal very rapidly.
Vanzolinii require small live prey to hunt. This is easily achieved by providing them with flightless or wingless fruit flies. Baby and juvenile vanzolinii will eat Drosophila melanogaster fruit flies, Springtails are also a wonderfully sized snack for these fingernail sized frogs. The flies and springtails on their own are a poor nutritional source. We recommend “dusting” your fruit flies with a high quality vitamin and mineral supplement. We use and recommend Dendrocare all in one vitamin/mineral supplement. You can combine and use other supplements available to you, however please ensure you research what ratio or frequency you can supply vitamins as some can be lethal in high dosages.
It is recommended to build a bioactive vivarium for your dart frogs. This is achieved by introducing isopods and springtails into the environment. These little land crustaceans (no they are not insects!) will eat the decaying and decomposing bio matter as well as any excess feces in the vivarium. Some of these micro fauna will be eaten by your dart frog, as a little snack.
As with all our frogs, we do not recommend that you house multiple species or morphs together. Please supply each group with a vivarium to call their own.
Breeding in Captivity
If you have provided all the necessary parameters to keep your vanzolinii happy and healthy, they are considered easy to moderate to breed in a vivarium. This makes them a popular choice for many dart frog enthusiasts, but less common with beginners. Eggs will be laid in the leaf litter or in a bromeliad in a secluded location. Many hobbyists will place a film canister, at 35-45 degrees on the floor of the enclosure, on its side or even upside down. The male will clean and protect the eggs until they hatch. Tadpoles who are left to grow up with their parents will end up larger than tadpoles that are removed. Once the eggs hatch, the male will move the tadpoles to a pool or in a bromeliad and show the female where he has placed them. The female vanzolinii will feed her tadpoles by laying an infertile egg in their pool with them, for them to feast on however this is not always necessary as the tadpole may feast on algae or small insects that have drowned in their pool. This is called Non-obligate egg feeding. the female will feed an egg on average every 2-3 days until the tadpoles emerge from the water. Tadpoles will eat other food than the eggs, but the egg supplementation makes them healthier. The eggs take approximately 10-14 days to fully develop. The tadpoles will take approximately 60-80 days to fully metamorphosis into colorful little froglets.
Final Notes
Ranitomeya vanzolinii are beautiful, and easy to care for frogs. Sometimes shy, but willing to adapt to being watched quite easily, these polka dotted frogs are an excellent starter amphibian. Their uniqueness also makes them a must for any collector’s frog room!
