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(Epicrates cenchria sp)
by Eileen Underwood and Rebecca Sobol
For the Colordo Herpetological Society
Rainbow boas are so named because of the iridescent sheen imparted by microscopic ridges on their scales which act like prisms to refract light into rainbows. They can be found from Costa Rica and south into central South America. They have been found in forests, woodlands, plains and swamps. They are primarily nocturnal creatures, sleeping during the day and prowling at night. Rainbow boas range from 4 to 7 feet in length and can live for more than 20 years in captivity.
There are around nine to a dozen subspecies of rainbow boa (Epicrates cenchria sp). The most common in captivity are the Brazilian (E.c. cenchria) and the Colombian (E.c. maurus). The Argentine and Pervian rainbows are also fairly common. Not all are well defined and various subspecies have been interbred in captivity making identification of unknown subspecies a challenge. Differences are found in color, pattern and size. Juveniles have a very distinct pattern of ocelli which fades with age in some subspecies (e.g., E.c. maurus). The Brazilians (E.c. cenchria) are the largest with a length of around 6 or 7 feet. They are a slender boa, so a 6 foot rainbow boa is nowhere near as massive as a 6 foot common boa. Colombian rainbow boas (E.c. maurus) are typically 5 to 6 feet in length. The smallest subspecies is undescribed (by taxonomists), originating from the Jonestown area in Guyana (northern South America) (E.c. ssp.). This subspecies rarely exceeds 4 in length. There are breeders in the US working with this subspecies.
Care of all rainbow boa subspecies is similar although there are minor variations in prefered temperature reflecting temperature variations found through the large range of Epicrates cenchria. It appears that rainbow boas of one subspecies or another can be found anywhere that there is suitable habitat within their range. Since much of this suitable habitat is rather inaccessible, there may be other undescribed subspecies. Several islands off the coast of South America also have rainbow boas, and some subspecies only occur on one or two islands. See Fogel (1993) for a detailed range map.
The primary requirements for an enclosure is that it be large enough to provide the snake with exercise and that it retain heat and humidity. Babies will be calmer in a small enclosure, but larger adults need more room. For the first few months babies can be kept in plastic shoe boxes, one snake per box. Holes should be drilled in the sides for ventilation. Paper towels make a good substrate. There should be a water dish large enough for the snake to submerge itself, kept filled with clean water. As the snake grows it will need a larger habitat. The size of the water dish should increase as the size of the snake increases, and hide boxes and additional water dishes can be added as cage furniture in larger enclosures.
Adults can be very active and like lots of space. Neodesha brand plastic snake cages have been recommended (Fogel, 1983). He recommends a 36 inch model, but I prefer a 48 inch model or larger for a single adult. Glass aquariums are not recommended because they don't retain humidity, but 50 gallon aquarium with branches to increase usable space can be used as a small cage for a single animal. A large, tall cage with different levels and branches for climbing will give you more opportunities to see your snake moving around.
It is generally recommended that rainbow boas be housed individually except during breeding attempts. This is not a hard and fast rule, as long as all snakes have been quarantined and are healthy they should be fine in communal housing.
Substrates that have been used successfully with rainbow boas include newsprint, paper toweling, repti-bark (orchid bark), cyprus mulch, Astroturf (high quality, woven-backed), and Dri-dek tiles. Bark or mulch substrates can be misted to keep the humidity high. A humid-box containing damp sphagnum moss will usually be heavily utilized. A large tub of water with a hide box inside will usually be a popular spot too. The warm, damp conditions favored by Rainbow boas are also conducive to the growth of mold and bacteria, so cages and water dishes should be cleaned often. Recommended twice per week or more often as needed. Substrates should also be replaced or cleaned often.
Temperature preferences vary for different subspecies as they have adapted to different habitats, but all seem to do best when presented with ~10 degree gradient and a diurnal temperature cycle. A seasonal cycle may help when breeding some subscpecies. Brazilian rainbow boas (E.c. cenchria) do best with a nighttime low (NTL) temperature of 70F (21C) and daytime high (DTH) of 85F (29C), with an optimal ambient daytime temperature of 70 to 80F (21 to 27C). Colombian rainbow boas like it a bit warmer, but all rainbox boas will not tolerate extended exposure to temperatures 85F or higher. It is best to start with a temperature gradient centering in the mid to upper 70s, while providing a comfortable hideout at each end of the range and see where your animal spends most of its time, and adjust accordingly. Heat can be provided from one, or a combination of, an under-tank heat source (heating pad placed under ~one-third to one-half of the cage) and an overhead incandescent light (wattage determined based on size of cage and room temperature). Monitor your temperatures carefully.
All rainbow boas are extremely sensitive to dehydration and maintenance of high relative humidity is a must. Cages should be misted several times a day and a humid shelter should be provided. The humid shelter can be in the form of a plastic box with a hole at one end containing moist sphagnum moss. Pools of water large enough for the animal to soak its entire body in should be provided on both the cooler and the warmer sides of the cage. Screen top cages are generally not recommended because they allow too much evaporation. If the cage has a screen lid it should be partially covered with Plexiglas or a damp towel to help retain humidity. A relative humidity of 75-80% is ideal. Much lower than 50% for extended periods and regurgitation and death by dehydration may result. Because high relative humidity can encourage mold growth, rainbow boa cages must be kept scrupulously clean, with bedding and moss changed on a regular basis (preferably weekly or whenever soiled). Water dishes should be washed and refilled with fresh water at least twice a week.
As mentioned above rainbow boas are very sensitive to dehydration, so fresh drinking water must be available at all times along with larger, heated pools for soaking. A large tub placed in the warm end of the enclosure will help raise the relative humidity of the cage and provide a place to soak. Misting the entire cage several times a day will also help maintain required humidity. Snakes will drink out of any water source present in the cage, so soaking bowls need to be as clean as the "drinking water". Rainbow boas seem to be resistant to "blister disease" and will spend most of their time in moist areas, but a dry area should also be present at both ends of the temperature spectrum.
As nocturnal animals, rainbow boas probably do not need or benefit from full spectrum lighting, however it can bring out the iridescence of the snakes and can be used during the daytime. Incandescent lights can be used to help raise temperature, with white light being used during the day and red light at night. The red light will be lower wattage allowing the preferred drop in temperature at night. Red lighting at night has the added advantage of letting the animals movements be seen without disturbing its day/night cycle with bright light.
Rainbow boas in captivity eat primarily mice and or small rats. Larger specimen may eat medium to large rats. The size of the prey item is determined by the girth of the snake, with the prey about the same size or slightly smaller than the widest portion of the snake. It is recommended that only dead food items be offered to prevent injury to the snake. If the snake isn't hungry, a live mouse wandering around the cage may get bored and start nibbling on the snake. Neonates and juveniles can be fed every week to 10 days. Adults can be fed less often; a small meal every two to three weeks, or a large meal every four to six weeks. They are willing feeders and may become obese if allowed to overfeed.
Some hatchlings will be nippy, but with patience and increasing periods of handling they should calm down. Several authors have indicated a wariness and lack of complete trust in rainbow boas, making this boa less of an ideal "pet" snake and not a snake for children to interact with.
Since Rainbow Boas are live bearers the female's cage must be secure for the small young. Also deep water dishes that might be hard for a small snake to climb out of should be removed.
Fogel, David. (1993) Rainbow boas (Epicrates cenchria). Vivarium 5(2):28-29.
Mehrtens, John M. (1987) Living Snakes of the World. Sterling Publishing Co., Inc. New York.
Peters, James A. and Braulio Orejas-Miranda. Catalogue of the Neotropical Squamata. Smithsonian Institution, United States National Museum, Washington, D.C. 2 vols., 1970
Ross, M.D., Richard and Marzec, Gerald (1990) The Reproductive Husbandry of Pythons and Boas. Institute for Herpetological Research, PO Box 2227, Stanford, CA 94305.
Schuett, Scott P. (1994) Captive Maintenance and Propagation of the Brazilian Rainbow Boa (Epicrates cenchria cenchria). Reptiles 1(6):32-34.
Peters, James A. and Braulio Orejas-Miranda. Catalogue of the Neotropical Squamata. Smithsonian Institution, United States National Museum, Washington, D.C. 2 vols, 1970 Note: the following key is rated 2 on a scale of 1 (poor) to 5 (excellent).
Key to subspecies:
Epicrates cenchria cenchria-Amazon Basin; southern Venezuala, and coastal Guianas.
E. c. alvarezi-Provincia de Santiago del Estero, Argentina.
E. c. assisi-Piaui to northern Bahia in Caatina region of Brazil
E. c. barbouri-Marajo Island, Para, Brazil
E. c. crassus-Southern Brazil, Paraguay, and northern Argentina.
E. c. gaigei-Eastern lowlands of Bolivia and Peru.
E. c. hygrophilus-Estado do Amazonas and region of Rio Doce, Estado do Espiritu Santo, Brazil. Restricted on west by Serra do Espinhaco.
E. c. maurus-From Costa Rica to northern Colombia and Venezuala, probably northern Guianas; Trinidad, tobago, and Margarita Islands.
E. c. polylepis-Region of rios Canabrava and Pandeiro in western Bahia and eastern Golas, also Distrito Federal, Brazil.
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