San Diego Gopher Snake (Pituophis catenifer annectens) Care Sheet
Quick Facts
Common Name: San Diego Gopher Snake
Scientific Name: Pituophis catenifer annectens
Family: Colubridae
Native Range: Southern California into northern Baja California
Adult Size: Typically around 120–150 cm (4–5 ft), although larger individuals can occur
Lifespan: Commonly 15–20+ years in captivity, with Pituophis catenifer capable of living considerably longer
Activity: Primarily diurnal, with crepuscular or nocturnal activity possible during hot weather
Diet: Carnivorous – primarily small mammals
Reproduction: Oviparous (egg-laying)
Temperament: Active and inquisitive; juveniles can be defensive and are well known for loud hissing
Venomous: No
Introduction
The San Diego Gopher Snake (Pituophis catenifer annectens) is a large North American colubrid belonging to the Pituophis group of gopher, bull and pine snakes.
They are strong, active snakes that spend considerable time exploring, burrowing and investigating their surroundings. This makes them particularly interesting captives but also means that they benefit from considerably more space and environmental complexity than a basic snake enclosure provides.
Gopher snakes are also famous for their impressive defensive display. When frightened, an individual may flatten its head, coil its body, vibrate its tail and produce an exceptionally loud hiss. This behaviour is defensive and should not be confused with aggression.
With appropriate husbandry and regular calm interaction, captive-bred San Diego Gopher Snakes generally become confident and manageable animals.
Natural Range & Habitat
Pituophis catenifer annectens occurs in southern California and extends south towards Baja California.
The subspecies inhabits a surprisingly broad range of environments, including:
- Coastal sage scrub
- Grasslands
- Chaparral
- Agricultural areas
- Woodland
- Riparian habitats
- Semi-arid environments
- Foothills and mountainous areas
They are particularly associated with open habitats where rodents are plentiful.
Gopher snakes are accomplished burrow users and will enter rodent burrows while searching for prey or shelter. They are also capable climbers and swimmers.
This natural behaviour should influence captive husbandry: deep substrate, secure hides, environmental cover and opportunities to explore are highly beneficial.
Enclosure
San Diego Gopher Snakes are active, relatively large-bodied colubrids and should be provided with an enclosure that allows meaningful movement and exploration.
For an average adult, an enclosure around:
120 × 60 × 60 cm (4 × 2 × 2 ft)
should be regarded as a practical minimum.
Larger individuals and particularly active animals benefit from additional floor space, and enclosures around 150–180 cm long can provide considerably more opportunity for natural behaviour.
The enclosure must be extremely secure.
Pituophis are powerful and persistent snakes capable of exploiting surprisingly small gaps. Doors, vents and cable openings should therefore be checked carefully.
Juveniles can be housed in smaller secure accommodation, but they should be upgraded as they grow.
Temperature & Heating
A thermal gradient should be provided so that the snake can regulate its own body temperature.
A useful target is:
Basking/warm area: approximately 29–32°C
Warm side ambient: approximately 26–28°C
Cool side: approximately 21–24°C
Night: a moderate overnight temperature drop is acceptable
Temperatures should always be measured using reliable digital thermometers.
Any heat source capable of becoming excessively hot should be controlled by an appropriate thermostat.
The entire enclosure should never be maintained at the basking temperature. A genuine thermal gradient is important so the snake can move between warmer and cooler areas as required.
Lighting & UVB
A consistent day/night cycle should be provided.
Approximately 12 hours light and 12 hours darkness works well for general maintenance, with seasonal adjustment possible for breeders.
San Diego Gopher Snakes are primarily diurnal and are naturally exposed to daylight.
Although snakes can survive without artificial UVB when their other husbandry requirements are met, provision of suitable low-level UVB is recommended as part of a well-designed, naturalistic enclosure.
UVB should be provided in conjunction with shaded areas and hides so the animal can choose its level of exposure.
Always follow the manufacturer’s recommended positioning and replacement schedule for the specific UVB lamp being used.
Humidity
San Diego Gopher Snakes should not be maintained in permanently damp conditions.
Normal household-level humidity with good ventilation is generally appropriate, with approximately 30–50% relative humidity being a useful general range.
Rather than attempting to maintain one exact humidity percentage at all times, concentrate on providing:
- Good ventilation
- Dry surface conditions
- Constant access to clean drinking water
- A humid hide when required
A humid hide containing slightly damp sphagnum moss or another suitable moisture-retaining material can be particularly useful during shedding.
Persistent excessive humidity combined with poor ventilation can contribute to skin and respiratory problems.
Substrate
Because gopher snakes naturally investigate burrows and spend substantial periods underground, a substrate that permits digging is highly beneficial.
Suitable substrates can include:
- Aspen
- Lignocel
- Soil-based reptile substrates
- Suitable soil/sand mixtures
- Other dry, non-toxic substrates capable of holding burrows
A reasonably deep substrate layer should be provided wherever practical.
Avoid substrates that remain permanently wet or dusty materials that irritate the respiratory tract.
Paper-based substrates can be useful during quarantine or medical treatment but offer considerably less opportunity for natural digging behaviour.
Furnishings & Enrichment
At minimum, provide secure hides at both the warm and cool ends of the enclosure.
Additional furnishings can include:
- Cork bark
- Branches
- Rocks or securely positioned stone-effect furnishings
- Artificial or live plants where appropriate
- Leaf litter
- Tubes and tunnels
- Additional hides
- Deep areas of substrate
Despite being primarily terrestrial, gopher snakes can climb and will often make use of sturdy branches and raised platforms.
Changing some enclosure furnishings occasionally can provide additional opportunities for exploration, although the enclosure should not be completely rearranged so frequently that the animal is continually stressed.
Water
Fresh, clean drinking water must be available at all times.
The water bowl should be stable and large enough for the snake to drink comfortably.
Some individuals may soak occasionally, particularly before shedding.
Water should be replaced whenever contaminated and the bowl cleaned regularly.
Feeding
In the wild, gopher snakes consume a variety of vertebrate prey, but small mammals form the major part of their diet.
Wild prey includes rodents such as pocket gophers and mice, as well as rabbits, birds, eggs and occasionally reptiles and other animals.
In captivity, appropriately sized rodents provide a suitable staple diet.
Prey should generally be approximately appropriate to the snake’s body size rather than excessively large.
As a broad guide:
Hatchlings/Juveniles: approximately every 5–7 days
Growing animals: approximately every 7–10 days
Adults: approximately every 10–14 days
These are guidelines rather than fixed rules.
Feeding frequency and prey size should be adjusted according to the animal’s age, size, body condition, activity and reproductive status.
Obesity should be avoided.
Frozen-thawed prey is generally preferable because live rodents can seriously injure snakes.
Never leave live rodent prey unattended with a snake.
Handling & Temperament
Young San Diego Gopher Snakes can be remarkably defensive.
Typical defensive behaviour includes:
- Loud hissing
- Rapid tail vibration
- Flattening the head
- Coiling
- Striking
The extremely loud hiss characteristic of Pituophis is aided by a specialised structure associated with the glottis.
These displays can appear dramatic but are primarily intended to discourage a perceived predator.
Regular, calm and non-forceful handling usually results in captive-bred animals becoming considerably more confident.
Support the snake’s body during handling and allow it to move through your hands rather than restraining it tightly.
Avoid unnecessary handling immediately after feeding and during periods when the animal is clearly stressed.
Shedding
A healthy gopher snake should normally shed its skin in one complete or nearly complete piece.
Before shedding, colours become dull and the eyes typically turn cloudy or blue. The eyes may clear again shortly before the actual shed occurs.
During this period, ensure that fresh water is available and provide access to a humid hide.
Repeated incomplete sheds can indicate inadequate access to moisture, dehydration, husbandry problems or underlying illness.
Never forcibly remove retained eye caps.
Cleaning
Remove faeces, urates and contaminated substrate as soon as they are noticed.
Water bowls should be cleaned regularly and immediately if contaminated.
How frequently the enclosure requires a complete substrate replacement depends on the enclosure design, substrate and cleaning system being used.
Any disinfectant used around reptiles must be appropriate for animal housing and used according to its instructions.
Health
A healthy San Diego Gopher Snake should generally display:
- Clear eyes when not approaching a shed
- Clean nostrils and mouth
- Smooth, intact scales
- Regular tongue flicking
- Appropriate muscle tone
- Normal exploratory behaviour
- Consistent body condition
Potential health problems seen in captive snakes include:
- Respiratory infections
- Mites
- Internal parasites
- Retained shed
- Mouth infections
- Burns from uncontrolled heating equipment
- Obesity
- Dehydration
Signs such as wheezing, bubbling around the mouth or nose, persistent open-mouth breathing, significant unexplained weight loss, neurological abnormalities or prolonged abnormal behaviour should be assessed by a reptile-experienced veterinary surgeon.
New reptiles should ideally undergo an appropriate quarantine period before being introduced into an established collection.
Brumation
Wild San Diego Gopher Snakes undergo seasonal changes in activity and may spend colder periods in underground refuges.
Captive animals maintained purely as pets do not need to be deliberately brumated.
Brumation is primarily relevant when reproducing healthy, mature animals and should only be attempted when the keeper understands the process.
Animals should never be placed into brumation when underweight, ill or carrying unresolved health problems.
Breeding
San Diego Gopher Snakes are egg-laying snakes.
In nature, mating generally takes place after emergence from winter dormancy, with egg laying occurring during the warmer months.
Females of Pituophis catenifer may produce approximately 2–24 eggs, although clutch size varies considerably according to the female’s size, age and condition.
Captive breeding is normally preceded by a controlled winter cooling period.
Only mature animals in excellent physical condition should be bred.
Females require particularly careful monitoring because egg production places substantial demands on their body reserves.
A suitable laying box containing moist but not saturated substrate should be available to a gravid female well before laying.
Egg Incubation
Eggs should be incubated in a controlled environment using an appropriate incubation medium.
A temperature around 26–28°C is commonly used successfully for Pituophis eggs.
The incubation medium should remain humid enough to prevent the eggs from dehydrating without leaving them sitting in free water.
Depending on temperature and other conditions, incubation generally lasts approximately 60–80 days, with around 65–75 days being typical.
Snake eggs should not normally be rotated after laying.
Hatchlings are generally around 30–35 cm long and can usually be offered appropriately sized rodents once they have completed their first shed.
Summary
The San Diego Gopher Snake is a hardy and fascinating North American colubrid when its needs are properly met.
The most important aspects of successful husbandry are:
- A spacious and extremely secure enclosure
- A proper thermal gradient
- Deep substrate and opportunities to burrow
- Multiple secure hiding areas
- Appropriate lighting and a regular day/night cycle
- Access to clean water
- Appropriately sized rodent prey
- Good ventilation without excessively damp conditions
- Environmental enrichment and room to explore
Their size, strength, feeding response and sometimes dramatic defensive behaviour should be considered before obtaining one.
For keepers able to provide sufficient space and appropriate husbandry, Pituophis catenifer annectens can be an active, inquisitive and rewarding species to maintain.
Important: This care sheet provides general husbandry guidance. Individual animals may require adjustments according to age, health, reproductive status and environmental conditions. Veterinary concerns should be discussed with a suitably qualified reptile-experienced veterinary surgeon.