
Candling is a method used to check the development of embryos inside eggs during incubation. It involves shining a bright light through the egg to observe its contents, which can help determine whether the egg is fertile and how the embryo is progressing. When candling snake eggs, one should look for clear, well-defined veins and movement within the egg. The embryo should grow larger with each candling session. Non-fertile eggs will appear clear with no visible veins or embryo.
| Characteristics | Values |
|---|---|
| Days to candle | 4-7, 8-14, 15-21, 55 |
| Frequency | Periodically throughout the incubation period |
| Lighting | Dark room |
| Egg placement | Large end facing up |
| Indicators of healthy development | Veins, blood vessels, movement, embryo growth |
| Indicators of unhealthy development | Yellowing, drying out, lack of vein development, blood spots, mould |
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What You'll Learn

What to expect when candling snake eggs
Candling snake eggs is a method used to check the development of embryos inside the eggs during incubation. It involves shining a bright light through the egg to observe its contents, which can help determine whether the egg is fertile and how the embryo is progressing.
To candle snake eggs, you will need a candler, which is a special light designed for this purpose, or you can use a strong flashlight or even the light from your phone. Ensure the room you are working in is dark so you can clearly see inside the egg. The egg should be held with the large end facing up as this is where the air cell is located, and it is the best position for viewing. Place the egg over the light source so that the light shines through the egg. If using a candler, the egg should fit snugly against the light to prevent any light from escaping around the edges.
In the early stages of incubation (around days 4-7), you should expect to see veins spreading out from a central point and possibly a small dark spot, which is the developing embryo. In the mid-stages (around days 8-14), the embryo should be larger, and you may see it moving inside the egg. The veins will be more pronounced. In the late stages (around days 15-21), the egg will appear mostly dark as the snake grows, with a clear air cell visible at the larger end. Movement might still be visible, and the embryo will occupy most of the egg.
It is important to note that candling can be tricky, and it may be difficult to get the angle right or to see anything at certain stages of development. Even if the eggs look a bit mouldy or manky, they may still be fine. Healthy eggs will show clear, well-defined veins and movement within the egg. Non-fertile eggs will appear clear with no visible veins or embryo.
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How to candle snake eggs
Candling snake eggs is not very difficult, but you need to be careful. If possible, candle the egg without picking it up or handling it. Simply put the candle against the side of the shell that is exposed to the air. Turn out the room lights so the contents of the shell appear to glow.
You may be able to start seeing veins forming by about 14 days. The best indicators of progress are veins and blood vessels that continue to grow and spread. After a couple of weeks, you may be able to see movement as the embryo wiggles in the shell.
Signs that an egg has gone bad include:
- The egg is yellowing and starting to dry out more than the others.
- After 2-3 weeks, the egg is still clear with no vein development.
- A distinct blood spot with little or no veins.
- Mould developing on or very close to the egg.
- Lack of development compared to the rest of the eggs in the hatch.
However, don't give up on eggs until they are definitely not developing. Some eggs may appear to be behind, but it could be the viewing angle or other factors. If you are having trouble viewing the egg contents, turn out some lights or go into a dark room. Press the candler up to the shell and try to minimise the amount of light that escapes between the shell and the rim of the candler. If you have to touch the eggs, ensure your hands are clean and dry. Oil from your fingers can clog the pores in the egg shell and prevent the embryo from getting the oxygen it needs.
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Signs of a healthy egg
Candling snake eggs can help you determine whether they are developing normally or not. To candle an egg, simply put a candle against the side of the shell that is exposed to the air, in a dark room, and observe the contents of the shell as they glow.
- Veins and blood vessels: You should be able to see veins forming by about 14 days, and these veins and blood vessels should continue to grow and spread over time.
- Movement: After a couple of weeks, you may be able to see movement as the embryo wiggles inside the shell.
- Normal colour: A healthy egg should not be yellowing or drying out.
- No mould: If there is mould developing on or near the egg, this is a sign that something is wrong.
- Progress compared to other eggs: If one egg appears to be developing more slowly than the others, it may be a sign that it is not progressing as it should.
It is important to note that candling can be tricky, and it may be difficult to get a clear view of the embryo. Additionally, the light from the candle may disturb the snake embryos, causing them to wiggle. Therefore, it is recommended to minimise the amount of light that escapes between the shell and the candler, and to avoid touching the eggs with your hands, as the oil from your fingers can clog the pores in the eggshell and affect the embryo's oxygen supply.
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Signs of an egg gone bad
Candling is a technique used by herpetologists and reptile breeders to identify eggs. It involves holding an egg against a targeted light source in a dark room to observe its contents. While candling, if you spot any of the following signs, the egg has likely gone bad:
- Yellowing and drying out: A healthy snake egg is typically off-white in colour. If you notice that an egg is yellowing or drying out more than the others, it may be a sign of deterioration.
- Lack of vein development: After two to three weeks, a healthy developing egg should show some vein growth. If an egg remains clear without any veins, it may be a sign of an issue.
- Blood spots with little vein growth: A distinct blood spot within the egg, accompanied by little to no vein development, could indicate that the egg is not progressing as expected.
- Mould development: If you observe mould growing on or very close to the egg, it is a sign that the egg has gone bad.
- Lack of development compared to others: If one egg appears significantly less developed than the rest of the eggs in the clutch, it may be a cause for concern.
- Squishiness: While snake eggs have soft shells, if an egg feels squishy or appears slightly see-through, it could be a sign of deterioration.
- No movement: After a few weeks of incubation, you may be able to observe the embryo wiggling inside a healthy egg. Lack of movement could be a sign of an issue, but it may also be due to the angle or lighting conditions.
- Size discrepancy: A clutch of large eggs with one or two notably smaller ones could indicate that the smaller eggs are not viable.
It is important to remember that candling can be tricky, and it may be challenging to accurately assess the health of an egg without specialised knowledge. Additionally, it is crucial to handle snake eggs with care as they are sensitive, and improper handling can harm the developing embryo.
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What to do if the eggs are covered in a medium
When candling snake eggs, it is important to be very careful. If possible, candle the egg without picking up or handling it. Simply put the candle against the side of the shell that is exposed to the air. Turn out the room lights so the contents of the shell appear to glow.
If the eggs are covered in a medium, such as vermiculite and water or coconut fiber substrate, and you are unable to candle them, there are a few things you can do. Firstly, if you can pick up an egg without turning it, you can candle it that way. Alternatively, you could use a soft, fluffy brush, like a makeup brush, to gently brush the medium off the eggs while leaving them in their container, and then candle them. However, if you cannot remove the medium or if the eggs are glued down, it is best to leave them undisturbed and monitor them for any signs of mould, discolouration, or shrinkage, which could indicate that they are no longer viable.
It is important to note that snake eggs should not be rotated or turned, as this can be harmful to the developing embryos. If you are unable to candle the eggs due to the medium, you should ensure that the eggs remain warm and moist, with humidity levels maintained at around 90%. Keep the eggs in their original orientation and do not bury them more than halfway beneath the substrate, as this could cause them to suffocate.
If you are incubating the eggs artificially, it is important to use at least two thermometers to monitor the temperature at all times, with a thermostat controlling the temperature if possible. The ideal temperature range for snake eggs is between 27 and 31 degrees Celsius. Additionally, the incubator should be briefly opened every few days to provide fresh air and maintain the desired temperature and humidity levels.
Snake eggs typically hatch within 45 to 70 days if incubated properly. During this time, it is crucial to monitor the eggs closely and ensure that they remain undisturbed and in a stable environment.
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Frequently asked questions
Candling is a method used to check the development of embryos inside eggs during incubation. It involves shining a bright light through the egg to observe its contents, which can help determine whether the egg is fertile and how the embryo is progressing.
You will need a candler, which is a special light designed for this purpose, or you can use a strong flashlight. Ensure the room you are working in is dark so you can clearly see inside the egg. Hold the egg with the large end facing up, as this is where the air cell is located and it is the best position for viewing.
Look for clear, well-defined veins and movement within the egg. The embryo should grow larger with each candling session.
The egg is yellowing and starting to dry out more than the other eggs. After 2-3 weeks, the egg is still clear with no vein development. A very distinct blood spot with little or no veins. Mould is developing on or very close to the egg. Lack of development compared to the rest of the eggs in the hatch.
If you are having trouble viewing the contents of the egg, try turning off some lights or going into a dark room. Press the candler up to the shell and try to minimise the amount of light that escapes between the shell and the rim of the candler.











































