Black Throated Monitor Diet

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Black throated monitor diet questions almost always start from the same worry: this lizard gets big, eats fast, and looks hungry all the time. In the wild the white throated monitor (Varanus albigularis) is an opportunistic carnivore of the African savanna. The black throated form, Varanus albigularis ionidesi, is a subspecies of it.

Both take whatever invertebrates and small animals they can catch or dig up, rather than specializing on one prey type. Captive keepers need to copy that variety with a rotation of whole foods. A single feeder insect or a weekly rat is not a diet.

What black throated monitors eat in the wild

White throated and black throated monitors forage through dry savanna, scrub, and rocky ground across southern and eastern Africa. They dig for buried food and use their forked tongues to track prey by scent. Their build, a heavy body on short but strong limbs, suits digging over sprinting.

The wild menu leans heavily on invertebrates. Snails, millipedes, beetles, and other large arthropods are the items most often reported. No field diet study could be opened for this article, so no percentages are given here.

Land snails are widely described as a signature prey item for this group of African monitors. The lizard’s blunt rear teeth are suited to crushing shells rather than shearing flesh.

Eggs, including those of ground nesting birds and other reptiles, round out the natural diet. So do small vertebrates such as rodents, birds, and other lizards, plus carrion when it turns up.

Researchers working in the Kgalagadi Transfrontier Park, a semi arid savanna spanning South Africa and Botswana, have documented white throated monitor populations in exactly this kind of open, invertebrate rich habitat. That fits an opportunistic, shell crushing, digging forager, not a narrow diet.

LafeberVet describes the closely related savannah monitor (Varanus exanthematicus) as a scavenger. It covers large distances searching for small prey items.

The two species share the same African savanna niche and the same stout, digging build. Feeding advice written by veterinarians for the savannah monitor is the closest published guidance available for this subspecies.

What do black throated monitors eat in captivity

A captive black throated monitor diet should mirror that wild variety as closely as practical. That means an invertebrate based menu at every age, not a rodent based one.

LafeberVet’s savannah monitor sheet recommends gut loaded insects such as large crickets, superworms, king mealworms, silkworms, grasshoppers, and cockroaches. It adds crayfish and other low fat foods such as cooked egg whites. Rodents are listed as an occasional item only, because they raise the risk of obesity.

• Gut loaded roaches, large crickets, superworms, silkworms, and grasshoppers as the everyday base at every age.
• Captive bred land snails and crayfish as regular items that reflect the shell crushing wild diet.
• Cooked egg whites or whole cooked eggs offered occasionally, echoing the egg predation seen in wild monitors.
• Whole prey rodents (appropriately sized mice) as an occasional item, not the weekly staple many older care sheets describe.
• Day old chicks in the same occasional slot as rodents, since they are similarly calorie dense.

A published husbandry account for the black tree monitor, a far smaller arboreal species, shows how insect heavy a monitor diet can be. Fischer (2012) fed that species more than 90% insects by mass, topped up with fish, egg, and chick. The lesson carries across the genus: insects can be the base, with vertebrate prey as the supplement.

Feeder insects should be gut loaded for at least 24 to 48 hours before being offered. An insect’s own gut contents pass directly into the lizard.

A short guide to gut loading feeder insects covers the practical steps.

A wider look at feeder insect options helps with rotating species for variety.

Black throated monitor feeding schedule by age

Feeding frequency and portion size change a lot as a black throated monitor grows. A hatchling weighs a few dozen grams. An adult is a heavy bodied lizard many times that mass.

No formal published feeding trial exists for this subspecies. The adult figure below is the LafeberVet recommendation for the savannah monitor.

The younger age rows are the common keeper standard for African monitors. Every row should bend to body condition, not the calendar.

Offer only as much as the animal can eat within about 15 to 20 minutes. Let visible body condition, not the calendar, guide the next meal. A monitor carrying visible fat pads at the tail base or flanks should have its feeding frequency cut back right away.

Portion sizes and feeding technique

Rodent or chick prey should be no wider than the monitor’s head, and ideally a bit smaller. Monitors swallow prey whole rather than tearing it apart first. Prey that is too large risks regurgitation, which is a real health risk in large lizards, not something to shrug off.

Rodents should be offered freshly killed or thawed and warmed, never live. The Merck Veterinary Manual advises against live rodents because of the danger of prey inflicted injury.

It also notes that rodents frozen for long periods, especially obese ones, may carry fewer nutrients and excess calories. Use feeders frozen under four months.

Feeding tongs let a keeper place prey precisely and keep fingers clear of a fast feeding response. They are worth using with any monitor past juvenile size. A pair of long feeding tongs is a low cost, high value piece of equipment for this reason.

The general guide to what lizards eat covers appropriate prey choices across the monitor family.

Feed in a separate container or a set spot in the enclosure, not always at the basking site. This cuts down on substrate ingestion and lets a keeper track exactly how much food was actually eaten.

Obesity risk in black throated monitors

Obesity, not malnutrition, is the more common feeding related problem in captive black throated and white throated monitors. Their fast feeding response, paired with a sedentary captive life in an enclosure smaller than their natural range, makes overfeeding easy.

Calorie dense rodent prey offered too often is the usual culprit. That is exactly why LafeberVet limits rodents to an occasional item for the savannah monitor.

Signs of an overweight monitor include a rounded, sagging belly, visible fat deposits at the tail base and neck, and reduced activity. The fix is straightforward.

Cut feeding frequency and add enclosure space and enrichment to encourage movement. Shift the diet back toward gut loaded insects, snails, and egg white, which carry less fat per gram than rodent prey.

A black throated monitor’s adult size is shaped heavily by how much it is fed as a juvenile. Some keepers overfeed young animals on purpose to push growth toward an impressively large adult. That trades long term joint and organ health for short term size, and this guide does not recommend it.

Calcium, vitamins, and supplementation

Whole prey such as rodents and day old chicks already contains calcium in its bones. Feeder insects do not, and they carry a poor calcium to phosphorus ratio on their own. LafeberVet’s savannah monitor guidance calls for a calcium supplement with a calcium to phosphorus ratio of at least 2 to 1.

• Dust insect feedings with a plain calcium powder without added vitamin D3. LafeberVet advises avoiding vitamin D products for this group to prevent toxicity. UVB lighting lets the lizard make its own D3.
• Non breeding adults need calcium supplementation about once weekly under that guidance. Fast growing juveniles on an insect diet are usually dusted at most feedings, a common keeper standard.
• Offer a general vitamin and mineral supplement once weekly, the LafeberVet schedule for the savannah monitor. This fills in trace nutrients without overdosing fat soluble vitamins.

A multivitamin works best dusted lightly over insects rather than whole prey. Whole prey already supplies most of the vitamins and minerals a monitor needs from its own skeleton and organs.

Weighing a monitor regularly on a digital gram scale catches weight gain or loss early, well before it is visible by eye. Regular weigh ins also help calibrate the feeding schedule above for an individual animal.

Water and fresh food handling

Fresh, clean drinking water should be available at all times and changed daily. LafeberVet’s savannah monitor sheet also calls for access to a larger soaking tub at least one to two times weekly.

This species drinks and soaks readily, especially after a large meal. It often defecates in the water, so check it more than once a day.

Uneaten insects left loose overnight can nibble on a sleeping or shedding lizard. Remove any feeder insects not eaten within the same day rather than leaving them to roam the enclosure.

White throated monitor diet versus black throated monitor diet

The black throated monitor is a subspecies of the white throated monitor, not a separate species. White throated monitor diet and black throated monitor diet follow the same principles.

Both rely on gut loaded insects, snails, and other low fat whole foods as the base. Occasional rodents, occasional eggs, and careful portion control round out the plan.

The main practical difference is size, covered in more depth on the size and growth page. A larger individual needs larger prey items and, because of its greater mass, carries an even higher risk from persistent overfeeding.

Keepers moving between care information written for “white throated monitor” and “black throated monitor” can treat feeding guidance for one as applicable to the other. Only the portion size needs adjusting, not the diet’s makeup. The monitor lizard diet guide is the next read for the wider family.

The general monitor lizards overview compares the African species with the Asian and Australian monitors.

Frequently Asked Questions

What do black throated monitors eat?

A captive diet centers on gut loaded insects, captive bred land snails, crayfish, and low fat foods such as cooked egg white. Rodents and chicks are occasional items, following veterinary guidance for the closely related savannah monitor. Wild individuals eat mostly invertebrates such as snails and beetles, plus eggs and small vertebrates.

What to feed a black throated monitor as a hatchling?

Hatchlings do best on small, gut loaded feeder insects sized to their head width, offered daily. Add snails and an occasional pinky mouse as the animal grows large enough to manage them. Insects should be dusted with calcium at most feedings during this fast growth period.

How often should I feed an adult black throated monitor?

LafeberVet recommends two to three feedings a week for the closely related savannah monitor. That schedule is the working standard for adult black throated monitors too.

Keep those meals insect and snail based. Rodents at every feeding are the most common cause of obesity in this subspecies.

Can black throated monitors eat only insects?

An insect based diet is the recommended base at every age, provided the insects are gut loaded and dusted with calcium. Add snails, crayfish, and egg white for variety. Rodents and chicks belong in the diet only occasionally because of their fat content.

Do black throated monitors need calcium supplements if they eat whole prey?

Whole rodents and chicks contain bone calcium, but they should only be an occasional item. The insect based part of the diet needs a calcium supplement with at least a 2 to 1 calcium to phosphorus ratio.

LafeberVet suggests about weekly for non breeding adults. A reptile veterinarian can adjust that schedule to UVB exposure and diet mix.

Is the black throated monitor diet different from the white throated monitor diet?

The two share the same diet composition, since the black throated form is a subspecies of the white throated monitor. The only adjustment is prey size, which should track the individual animal’s head width rather than its label.