Feed schedule & food size

Green Tree Python Feeding Schedule & Food Size

The following information should be used as a guideline, rather than a “set in stone” schedule. This information assumes that your neo, yearling, sub-adult or adult is established: that it is eating and shedding regularly, is set up in an appropriate cage, and that it has no health issues. It is important to learn to read your animals and determine what they need.

Since every snake has its own metabolic rate, each should be treated as an individual. A GTP’s common hunting position is head down, often accompanied by caudal luring, and many will assume this position nightly. In addition, many green tree pythons would likely eat every time they were offered food. Remember that chondros are opportunistic hunters and in their natural habitat they aren’t successful every time they hunt. In captivity, most would eat far more than they should because thousands of years of evolution has taught them to eat at any opportunity; in the wild, meals might come days, weeks, or months apart.

Some keepers set feeding schedules, such as one meal every 15 days. Others use a combination of schedules and defecation frequency. For example, an animal might be fed every 15 days, but if it hasn’t defecated between meals, the next feeding would be postponed. Feeding/defecation records help monitor the size and amount of food being consumed. Just remember that you’ll have to adjust your schedule and food size periodically based on factors such as age of your animal, whether it is male or female, time of year, etc. Take the time to know your chondro and observe what it is telling you.

Some keepers let the snake tell them when they are ready to eat. This is easiest with more sedentary animals that sit in the same place for days after eating. Waiting until they are actively hunting at night, such as moving to lower branches or crawling around on the cage floor, is a good way of evaluating hunger. This method will help maintain a correct size to weight ratio, and the increased activity will help keep them defecating regularly and will encourage exercise.

Another thing to consider with feeding frequency and meal size is its affect on hydration. Since a larger meal requires more time and energy to digest, a snake would likely spend more time basking. Prolonged elevated body temps encourage water loss, and a larger meal requires more water to digest. These factors are more likely to increase kidney stress and add to dehydration.

Many keepers go by the general rule that a meal should be big enough to make a small but noticeable lump once consumed. Others choose to feed more frequently, but smaller food items. Below is a size chart used by many breeders of rodents that may help you determine the size you need.

Feeder Mice Sizes

Size Weight (g) Length (in) Age (days) Fur Weaned
Day Old Mice 1.0-2.0 .75-1 1 No No
Med/Lg Pinky Mice 2-4 1+ 2-5 No No
Small Fuzzy Mice 4-5 1.25-1.50 6-9 Little No
Large Fuzzy Mice 5.1-7.5 1.50+ 10-14 Little No
Hopper Mice 7.6-9.9 2.25+ 15-18 Yes Almost
Small Mice 10-14 2.75+ 18-24 Yes Yes
Adult Mice 15-19 3+ 25-35 Yes Yes
Large Mice 20-29 3.5+ 35-45 Yes Yes
Jumbo Mice 30-50 4.25+ 120+ Yes Yes

 Feeder Rats Sizes

Size Weight (g) Length (in) Age (days)   Fur Weaned
Pinky Rats 5-9 2+ 1-5   No No
Fuzzy Rats 14-19 2.5+ 6-10   Little No
Pup Rats 20-29 3+ 11-15   Yes No
Weaned Rats 30-40 3.5+ 16-19   Yes Yes
Small Rats 40-65 4.5+ 20-26   Yes Yes
Small/Med Rats 70-95 5+ 27-30   Yes Yes
Medium Rats 100-130 5.5+ 31-35   Yes Yes


A neonate can be considered a green tree python that weighs approximately 7- 80 grams. Since neos have faster metabolic rates and defecate with greater frequency, they are typically fed once every 4- 6 days until about 5- 8 months old. Neonates will defecate anywhere between 2- 6 days following a meal.

Smaller hatchlings under 10 grams should be given day old pinks (1- 2 grams) for the first 3- 4 feedings. As neonates grow they can be progressively moved up to medium pinks (2- 3 grams), large pinks (3- 4 grams), and crawlers/fuzzy pinks. When to move up to a larger prey item is based largely on intuition and experience, but again, aim for a meal that leaves a barely noticeable lump.

From Neonate to Yearling

By the time a green tree python reaches 80-100 grams you may choose to move to weekly feedings. At this size your snake will likely be eating small fuzzy mice (4- 5 grams). As when feeding pinkies, as your chondro grows you can move to progressively larger fuzzies. This might correspond to medium fuzzies (5- 6 grams) at 6 months of age, and large fuzzies (6- 7 grams) at 9 months. By 12 months old your animal should be taking hopper mice (7-10 grams) up to small weanling mice (10-14 grams).


While definitions vary, a sub-adult can be considered an animal from 200-500 grams. This depends on several factors including sex, feeding frequency, and underlying genetics. Sub-adults are typically fed on a 10- 15 day schedule.


As green tree pythons enter adulthood you should take a more conservative feeding approach. Remember chondros are good at getting fat!  Things that need to be considered are your snake’s sex, metabolic rate, frequency of defecation, and the size and type of food being given. Remember that the cage temp is going to affect the snakes metabolism and hydration. Temps on the high side tend to increase the metabolism and the need for water. Temps on the lower end of the temp rage tend to slow down the metabolism and decrease the need for water. 

The concept of the ideal weight for an adult chondro is slowly changing. As more members share their experiences and observations on the detrimental effects of obesity, we are adjusting our husbandry accordingly. A GTP is an arboreal snake and should be lean to be able to move around easily. Also, they tend to be more active when fed sparingly, and considering their restrictive environments in captivity, anything that promotes exercise is a good idea. It is also suggested that skinnier animals live longer and make better breeders.

Some adults can be problematic eaters. For example, moving an adult across country or just to a new enclosure within the same room can trigger a change in feeding. Some may only prefer live or fresh killed, and will refuse frozen/thawed. Some may only eat rats, or only mice. Adult males might not eat for 4 months or more, especially during breeding season. If this happens you must be patient, and you may have to adjust your feeding technique or food item.

A word of caution about feeding adults: Sometimes a snake might strike and wrap the mouse and the feeding tongs. If this happens, it is best to leave the snake alone and monitor it while it eats. It is highly unlikely that it will try to consume the forceps.

Adult Females

Adult females typically weigh from 750 to 1,100 grams. Smaller examples could weigh as little as 600 grams, whereas larger specimens can reach 1,800 grams or more. Adult females are usually fed once every 2- 4 weeks depending on the size of the rodent. Some breeders feed females more frequently in the months prior to breeding, as well as following egg deposition. But caution should be taken to not engorge your females with food prior to laying eggs. This is because excess fecal matter can block the movement of eggs during oviposition.

Adult Males

Adult males typically weigh from 300 grams to 850 grams. Again, slightly lighter or heavier animals make up a small percent. Adult males can be considerably smaller than adult females, and some will breed and produce offspring at around 300 grams. Adult males are normally fed an adult or large mouse bi-monthly, depending on the snake. Some sexually mature males often go off feed (fast) during the breeding season and are not likely to become obese, but they should still be monitored. Males can fast for 4-9 months, or not at all, but surprisingly they lose little weight during this time.

Cross contamination

Uneaten food items should not be offered to other animals. Even if an uneaten food item only contacts the cage or perch, it has the potential to spread disease-producing bacteria. That being said, a lot of keepers keep one or two “garbage disposal” snakes. Snakes like Corn snakes, King snakes or Rat snakes are used to dispose of unwanted food items when there is a minimal risk of contamination.

Feeding Neonates 

Feeding a stubborn neonate is a learned art. It involves a lot of trial and error, and even more patience. As a new chondro owner, it is strongly recommended to purchase a well-established neonate without feeding issues. But even well-established neos can begin refusing food when shipped or moved to a new environment. By copying the breeder’s/previous owner’s exact environmental conditions a neo will feel more secure and comfortable and is more likely to resume normal feeding habits. That being said, what works for one clutch, or one individual, might be a complete failure for another. So you may have to go through a list of tricks to find what works best. The following are some suggested methods that might help get your non-eater eating again. Before you attempt to feed problem feeders, make sure you will not be interrupted or distracted during feeding time. Have a beer, glass of wine, put on relaxing music, or do whatever it takes to be calm and relaxed before you start. Patience is the key!

·         –  Make sure the size and conditions of the enclosure are the same as the one from which they came.

·         –  Don’t try too often; wait at least 3 days between feeding attempts.

·         –  Cover the cage with a towel while the animal settles in. This will increase its sense of security.

·         –  Try feeding right after a shed.

·         –  Try to feed about an hour before lights out.

·         –  Try a mid day feeding, or an early morning feeding.

·         –  Leave thawed pinkies/fuzzies in the tub or on the perch overnight.

·         –  Be mindful of the temp of your food; some like it very warm some may like it at room temp.

·         –  You can also offer them a pink head, which is hard to drop once grabbed.

·         –  Try placing the pink in their coils, if they tighten up around the pink, try to leave as slowly as possible or just sit there very still.

·         –  Try not to let them see you; let them see only the food offering.


Sometimes neonates need to be stimulated to induce striking. When you can elicit strikes, you’re half way home to successful feedings. Some neos will require more aggressive teasing than others. For example, some neos will only strike after subtle pinching, prodding, slapping, or poking with the food item. However, neos have very fragile backbones and injuries (kinks or divots) can result if your technique is too aggressive. There is a grey area between too gentle and too aggressive, but confidence will be gained with experience.

There are a few locations on a neo’s body that trigger strikes when tapped with the pinky or tongs. The areas on the sides of the neck just beyond the head are usually the most sensitive, and firmly “bopping” this location will usually elicit a strike. For particularly stubborn neos, alternating bops from left side to right side can be helpful. The tip of the tail is also very sensitive and can help encourage striking. When neos repeatedly strike and drop, be persistent. Giving up too early can be the difference between frustration and a snake with a full belly. Also, it’s not unusual for neos to repeatedly spit pinkies out/drop them and it may require several strikes before they hold and swallow. Many times the pinkie will be dropped if it isn’t grabbed by the head. So focus on how the pinkie is presented to increase the chances it’s grabbed by the head. When a strike results in a pinkie’s nose being lodged in the back of the snake’s mouth, it is much more likely to hold and swallow. If there is no interest and a neo keeps running away, stop after about 5-10 minutes and try another day.

Alternative Food Items

The following food items have been used with varying degrees of success. It should be noted there are different schools of thought about wild food items like frogs and lizards. Some feel that neos should never be fed wild food items due to the potential to become infected with foreign bacteria or parasites. Others feel that the potential risk is worth the reward that may come from a successful feeding. If you do resort to lizards, frogs, or other wild food item, be sure to have periodic fecal tests run by your veterinarian. The following is a list of alternative food sources sometimes used by breeders:

·         –  Brained pinkies

·         –  Gerbil and hamster pinkies

·        –  Scented pinkies (see below)

·         –  Small frogs such as cricket or tree frogs

·         –  House geckos, anoles, skinks, baby crested geckos

·         –  Raw chicken strips

·         –  Crickets/grasshoppers


Transferring the scent of an alternative prey onto a pinkie is often preferred to directly feeding the alternative item. Scenting involves simply rubbing a pinkie on whatever scent (frog, anole, etc.) you are trying to transfer to the pink. The scent item can be live or frozen, but should not be reused after the feeding session. After the GTP routinely eats the scented pinkie, less and less scent is added until they regularly eat unscented pinkies. The time frame this takes will vary from snake to snake. The following are a few commonly used scenting options:

·         –  Chick down

·         –  Adult mouse or rat fur

·         –  Gerbil or hamster fur

·         –  Frog scent

·         –  Lizard scent (such as shed)

·         –  Egg yolk

·         –  Canned tuna juice

·         –  Chicken or beef liver juice

·         –  Raw chicken juice

Interfering Factors

The following is a list of some issues that can influence how successfully your snake feeds:

 Too Much Light – Some neos feel exposed and uncomfortable if there is too much light. Covering the tub with a dark cloth or moving them to an opaque tub might be helpful. ·        
Too Much Movement
 – Do your best to open tubs with as little disturbance as possible. Some neos will strike, wrap and hold a pinkie only to immediately drop it upon sensing the slightest movement by you. Some are so sensitive that you may have to sit perfectly still until they finish eating. However, most will continue to swallow once they have begun doing so. The best idea is to take notes on each   neo’s feeding habits to better prepare for success with each feeding attempt.

Pinkie size – Some neos will drop pinkies that they find to be too heavy or too large. Others might be encouraged to wrap and swallow a heavier prey item. So experiment with different prey sizes with stubborn feeders. Small neos are usually started with XS or 1-day-old pinks. But the goal should be switching them to large pinkies as soon as possible; aim for around the 4th or 5th meal. Larger pinks have more nutrition, but they can be difficult for some neos to get used to. Again, learning to read what your chondro is telling you is crucial for cracking stubborn feeders.


Runners are often the most difficult neonates to establish. The typical behavior of runners includes flailing, fleeing, and lunging out of the tub. With neos that initially strike but then quickly begin running, in the short term you may be better off backing down and trying again another day. Also, changing the time of day you attempt to feed a runner might prove successful. Some keepers have had success feeding runners on the ground. This involves closing the tub once the animal is grounded, waiting 20 -30 seconds, and then promptly opening the tub and using teasing techniques to elicit a strike. By coaxing the chondros into a defensive mode, you can sometimes encourage it to start striking. Repeat this technique several times until you are convinced you are no longer making progress, or you win the battle.

Some neos respond better to very little physical teasing once on the ground. Tapping on the tub, or just the motion of pulling the tub out is enough to elicit a strike. Often with this type of neo, excessive physical contact will set them running again. This technique requires patience and may need to be repeated several times to be successful. Then again it may never work. The time you spend with this technique is ultimately up to you, but don’t wait too long before moving on to the next step.

If you are just not able to elicit strikes, you might choose to offer a live prey, such as pinkies, lizards, or frogs. The best and least stressful approach is to leave the prey in the enclosure over night as opposed to presenting with tongs. The natural movements of the prey may trigger the hunting/ eating response more effectively than the simulated movements of a dead item on tongs. If successful, after a few live meals they can be transitioned from live prey to scented pinks, and then to unscented pinks. If none of these methods proves successful, you will need to consider assist feeding. The amount of time before resorting to assist feeding will depend on things like the appearance of the animal, the size at birth, how much yolk (if any) was left behind in the egg.

Head Tuckers/Hiders

These neos are generally shy and need to be provoked to un-tuck their heads and begin tongue flicking. Feeding during the day sometimes works well, as does attempting to mimic something crawling across the snake’s body. Opening and closing the tongs with the tips gently contacting the snake’s body is another effective technique to encourage a shy neo to un-tuck its head. At times, shy neos turn into “runners.”

The Grab & Drop Neonate

Some neos will exhibit overly aggressive behavior, and will repetitively grab and throw pinks. One way to counteract this is to offer only a pink head. When the snake strikes, try to position the pink head in the snake’s mouth as far back into the throat as possible. With a bit of practice you’ll be able to lodge the head, and after a few unsuccessful attempts to dislodge it, the snake will give up and swallow the meal. You need to be extra cautious with this type of neo since their aggressive behavior can cause injuries, like spinal kinks.

Assist Feeding 

If you can’t successfully establish a neonate it will eventually starve itself to death. About five to six weeks is as long as you should wait before moving to assist feeding a pink head. After 5-6 weeks, they will start becoming too weak to work with and you may miss your window of opportunity. Also, as their energy levels drop they will stop drinking and quickly become dehydrated. 

Assist feeding is used when all of the above methods have failed. There is a difference between “force feeding” and “assist feeding.” Assist feeding can be as simple as getting the pink head wedged in the mouth during a strike. This would be considered an assist feed because the animal does not wrap the prey, but rather swallows only after giving up its attempts to dislodge the pink from its mouth. There is a clear difference in behavior for a stuck pink, and a pink that the snake intends to eat. When assist feeding, do not force the pink head down the snake’s throat. Instead, simply try to lodge the pink head in a way that it can’t be spit out. When done correctly (which will likely take many attempts) the snake will eventually swallow. A mouse leg or tail can also be used in place of a head. But you might need to move it into the throat a bit deeper than you would a pink head. It should also be noted that mouse and rat tails are not very nutritious but do provide some much needed calcium. If you do resort to assist feeding you might consider alternating between rat/mouse tails and pink heads.

Force Feeding

Force feeding should always be the last resort. Many feel that if the animal gets to this stage, they just were not meant to live. Ultimately you will have to make that decision. Force feeding a gtp neo involves gently coaxing a food item all the way down the snake’s throat. In other words, the snake does not swallow on its own. If the meal isn’t moved far enough down the throat, the snake will likely regurgitate, or try to regurgitate it.

Small to medium rat tails are a good choice for force feeding since they seem to be less stressful on the neo. As mentioned above, they don’t offer much nutrition, but it can be enough to keep their weight from dropping. Most neos being fed this way will swallow on their own once the end of the tail gets to the end of the snakes nose. Each one will have a different point at which they will swallow on their own. This method is useful because you can gradually decrease the amount of tail you need to coax down the throat, and the snake gradually learns the swallowing motion. Therefore the goal is to move from force feeding, to assist feeding.

Credit: Matt Morris and David Newman

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