Everything has gone as planned. You’ve bought a pair of baby pythons from a breeder and raised them for a couple of years. You’ve watched them grow, cared for them, cleaned them and touched things with your bare hands the likes of which your mother would not approve. You’ve fed, cooled, cycled and worried about them, and now you find your female coiled around a beautiful, white clutch of fertile eggs. You planned for this, and you are ready for the challenge ahead, right? Well, maybe not if a lot of my springtime phone calls are any indication. But fear not, there is no need for nail biting, sleepless nights or teeth gnashing. Follow some simple guidelines, and your eggs will hatch.
What Reptile Eggs Need to Hatch: Eggs have certain requirements, and once they are met, a good, viable egg will hatch. There are many ways to get from point A to point B, and the egg doesn’t care how as long as it gets what it needs. Egg requirements fall mostly into two categories: temperature and humidity. And for most species of python eggs, the requirements are identical: a temperature of 90 degrees Fahrenheit combined with high humidity. Nearly every python egg has been hatched by the female that laid it. Female pythons are good mothers and have been programmed by millions of years of evolution to do one thing: make baby pythons! Female pythons of different species have varying control over both temperature and humidity. All pythons coil tightly around their eggs throughout incubation. Strangely, even though pythons are cold-blooded animals, female pythons of several species have the ability to raise their body temperatures through physiological means and maintain it throughout the incubation period. Burmese pythons contract their muscles in a rhythmic shivering or twitching to generate heat. Reticulated pythons, African rock pythons and others accomplish the same increase in body temperature without these visible contractions. In both cases the snake’s body and the eggs themselves are maintained in a very narrow range of temperatures despite changes in the ambient temperature. Other species, such as spotted pythons, ball pythons and carpet pythons, can influence incubation temperatures through behavioral means. Incubating females of these species bask until they raise their body temperature and then return to the eggs to transfer the heat to them. Preparing for Reptile Egg Deposition: Wild females select nesting sites based on several factors, including security, temperature fluctuation and moisture level. After the eggs are laid the female covers them completely with her body. Incubating female pythons are also able to influence moisture in the environment immediately around the eggs by behavioral means. The respiration of the eggs themselves generates some moisture. This moisture can be conserved if a female coils tightly around her eggs, or it can be allowed to escape if she opens her coils.Incubating female pythons constantly monitor temperature and moisture levels of their eggs, making adjustments throughout the incubation period. If allowing a gravid female python to incubate her own eggs, keepers must prepare in advance.
When to Set Up a Snake Nestbox Provide a nestbox a few weeks before eggs are due. It should be large enough for the coiled snake but small enough that her body touches the sides during incubation. For small species (e.g., carpets, ringed pythons, Macklot’s pythons), use a plastic Rubbermaid-type box with a side or top access hole. For larger species (e.g., Burmese, reticulated, African rock pythons), construct a wooden box about 24 inches square with 6-inch-tall sides and an open top. Cover the floor with about 3 inches of slightly damp sphagnum moss—damp enough to avoid dust but not wet. Most pythons shed about 30 days before laying; offer the nestbox after this prelay shed. Females typically spend most of their time in the nestbox the month before laying, arranging substrate to their preference. For instance, Burmese pythons create a bowl-shaped depression by pressing coils into the substrate and rolling it outward. In wooden boxes, this movement pushes moss to the corners and sides. In the wild, females can make deeper depressions, though some have successfully laid eggs on flat newspaper-covered surfaces. The Snake Egg Laying Process Laying takes several hours. Females coil loosely with tails centered, depositing eggs in a pyramid-shaped pile within the coils. After laying, they cover the eggs completely with their bodies. In smaller species, eggs may be so well concealed that lifting the female reveals no eggs—her body covers them top to bottom, preventing contact with the substrate. Maternal Incubation for Snakes Decide between artificial or maternal incubation. Many keepers use incubators due to unfamiliarity with female snakes’ incubation abilities. If leaving eggs with the female, maintain cage temperatures in the low to mid-80s Fahrenheit and around 80% relative humidity. Those new to maternal incubation may hesitate to fully entrust the female, often tempted to raise temperature and humidity excessively to “cover their bets,” but this is unnecessary.Female pythons can only raise egg temperature, not lower it. If ambient temperature is already at 90°F, they lose temperature control. Similarly, females can conserve or release moisture from incubation, but cannot influence humidity at 100% ambient levels. For successful natural incubation, provide environments where females retain some control. Remember: female pythons are perfectly suited to incubate their own eggs!
For species that don’t generate incubation heat (e.g., spotteds, balls, carpets), provide basking areas. Enclosure heat sources typically create warmer spots than average cage temperatures, allowing females to warm themselves. As ambient temperatures approach ideal incubation ranges, females reduce basking frequency and may stop entirely. Basking females are often shy and may immediately return to eggs if sensing nearby activity. During final incubation days, females loosen coils and expose eggs, causing egg temperature to drop near ambient levels. Monitor cage humidity carefully during this period. As hatchlings emerge, females remain loosely coiled around the clutch. Unlike wild nests where newborns disperse quickly, captive hatchlings cannot escape. Some babies may be accidentally crushed by females, so remove hatchlings as they appear when possible. Remember: wild snakes incubate in fluctuating conditions with daily temperature variations and weather changes. Your controlled snake room is far more stable. Monitor temperature and humidity with minimal interference for successful incubation. ARTIFICIAL INCUBATION Artificial egg incubation requires specialized incubators meeting python egg requirements. Most commercial poultry incubators cannot successfully hatch reptile eggs, including python eggs. Python egg requirements are simple but crucial: incubators must maintain optimal temperature and humidity levels throughout the incubation period. INCUBATOR SIZING Incubator size depends on egg quantity and species size. Options range from shoebox-sized units for small python clutches to room-sized installations for larger species’ eggs.For most hobbyists, an incubator capable of hatching one or two clutches of eggs per season is sufficient. Whether homemade or purchased, incubators should be constructed from materials with good insulation. Access should be through a side opening rather than the top, as top-opening designs lose heat more quickly due to heat rising. Additionally, incubators should be wider rather than taller to minimize temperature differentials from top to bottom.
Temperature in the incubator is maintained through the interaction of a heat source and thermostat. Heat can be supplied via heat tape, heat pads, or light bulbs. Precise temperature control is critical, with variations kept within one degree during incubation. Occasional fluctuations from opening the incubator are acceptable and do not significantly impact hatch rates. Species that do not generate heat during incubation can tolerate a wider temperature range and periodic fluctuations. In contrast, eggs from heat-generating species require exact and constant temperatures for successful development. The heat source should not have excessive capacity beyond what is needed to reach the desired temperature. In case of thermostat failure, an overpowered heater can quickly overheat and kill embryos, while a less powerful heater might save the clutch during short periods of excessive temperature. Thermostats Most thermostats are conventional on/off types, similar to household thermostats. They turn the heater on when temperature drops to a set point and off when it rises, resulting in inherent temperature fluctuations. I prefer proportional thermostats, which continuously monitor temperature and adjust heat output to maintain a constant set point. Instead of cycling on and off, these thermostats keep the heater always on at the required level. I recommend Helix thermostats for their accuracy, remote sensors, and easy-to-read digital display. Reptile Incubator Fans Uneven heat distribution is common in incubators, with warmer areas near the top and heat source. This issue is easily resolved by using a small fan to circulate air. I suggest using fans similar to those in desktop computers for effective airflow.They are small, quiet and fairly vibration free. It is not necessary for the fan to move much air. It doesn’t have to be windy inside by any means. The slightest movement of air will break up temperature stratification and provide a uniform temperature throughout the incubator. Even so, I still like to have several thermometers in various locations to monitor the temperature, so I can confirm this at a glance.
Maintaining Humidity in a Snake Egg Incubator The final area of concern is humidity. The body of an incubating female is an effective barrier between the eggs and the outside environment. Inside the coils eggs are in contact with the substrate, the mother or each other. By sliding your hand between the coils of an incubating female you can feel the increased level of heat and humidity. It’s your responsibility for duplicating this environment in an incubator. To do this I place the eggs in smaller containers inside the incubator. It’s easier to control the humidity in these containers than it is in the entire incubator. I use plastic containers manufactured by Rubbermaid, Sterilite or Iris. I place about 3 inches of damp vermiculite in each one, mixed equally with water by weight. Mixed in this way the vermiculite should be moist enough to clump together when squeezed, but not so much that it produces any water. Perlite mixed in similar proportions can be used successfully too for incubation. I nestle the eggs about one-third of their diameter into the incubation substrate. Normally, it is not necessary to add water during incubation. If the eggs partially collapse in the first few weeks, water can be added. Most python eggs will not regain their full, round form again, but if water is added to the substrate, further egg collapse can be prevented. Handling Snake Eggs Many, if not all, of the eggs may adhere to each other. I’m sure this is helpful to a big female retic that must look after 60 or 70 tennis-ball-sized eggs for nearly three months. It’s a bit inconvenient, however, when it comes to managing a 2-by-1-foot pile of eggs situated in an incubator. Eggs may be slowly and carefully peeled apart into smaller groups for incubation, but it is not necessary to separate each egg from the group. Some may be adhered at four or five points to other eggs. Others may not have contact with the substrate. This is the case with naturally incubated eggs too. Care should be taken to maintain the eggs in the same orientation in which they were deposited by the female, especially if more than a day or two have passed since they were laid. Place them gently into the smaller containers inside the incubator. Remember that each egg contains a living organism with its own oxygen requirement — so don’t pack too many eggs into one container. I don’t ventilate the smaller egg containers. Their loose-fitting lids and my occasional peek inside provide enough air exchange for successful incubation. The oxygen requirement increases as the eggs near hatching time.During this period, I remove the lid to check the eggs more frequently, which provides increased air circulation for the eggs.
Conclusion Python egg incubation is a simple and straightforward process. However, keep in mind that just as some individual animals are stronger and more vigorous than others, so are embryos within eggs. If one or two eggs do not hatch, it is likely not your fault. If more than that fail to hatch or if hatchlings display abnormalities in form or pattern, it may be necessary to review your incubation technique. Regardless of whether someone is a professional or an avid hobbyist, successfully hatching eggs remains one of the most rewarding aspects of our work.