Discoid Roaches for Monitors and Tegus: Feeding Guide

Feeding Discoid Roaches to Monitors and Tegus

Monitor lizards and tegus are the big dogs of the reptile world — intelligent, powerful, and perpetually hungry. Savannah monitors, Ackie monitors, black-throat monitors, Argentine tegus, and their relatives have dietary needs that scale with their impressive size. Feeder insects — particularly discoid roaches — play a critical role in their nutrition, especially during the juvenile growth phase when protein demands are highest.

This guide covers everything you need to know about using discoid roaches as a primary feeder for monitors and tegus: why they work, how many to feed, what size to use, and how they compare to the rodent-heavy diets that were once standard for these animals.

Why Discoid Roaches for Large Lizards?

For decades, the default diet recommendation for monitors and tegus was whole prey — primarily rodents (mice and rats). While whole prey has its place, the reptile-keeping community has increasingly recognized the problems with rodent-heavy diets for monitors:

• Obesity: Rodents are extremely calorie-dense and high in fat. Savannah monitors fed primarily on mice and rats develop severe obesity, which is the leading cause of premature death in captive savannah monitors.
• Fatty liver disease: Chronic high-fat diets lead to hepatic lipidosis — a life-threatening condition that is epidemic in captive monitors.
• Nutritional imbalance: A diet of whole rodents lacks the variety of nutrients that wild monitors get from eating insects, snails, scorpions, crabs, and other invertebrates.

Discoid roaches address all three problems. At approximately 20% protein and only 7% fat, they deliver the protein monitors need for muscle growth without the caloric overload of rodents. They can be gut-loaded with nutrient-dense produce to enhance their vitamin and mineral content. And they're closer to the invertebrate prey that wild monitors consume daily.

The Insect-Based Monitor Diet

Modern monitor husbandry — led by researchers and experienced keepers — increasingly recommends an insect-based diet for species like savannah monitors, Ackie monitors, and smaller monitor species. The reasoning is simple: in the wild, these animals eat primarily invertebrates, not mammals.

Wild savannah monitors eat a diet consisting overwhelmingly of insects (beetles, millipedes, roaches), snails, scorpions, and other invertebrates. Vertebrate prey makes up a small percentage of their natural diet. Feeding captive savannah monitors a rodent-based diet is like feeding a cat nothing but steak — technically edible, but nutritionally inappropriate.

Discoid roaches serve as the staple protein source in an insect-based monitor diet, supplemented with other invertebrates and occasional whole prey for variety.

Feeding Recommendations by Species

Savannah Monitors (Varanus exanthematicus)

Savannah monitors are the poster child for the insect-diet movement. The obesity epidemic in captive savannah monitors is directly linked to rodent-heavy diets.

• Juveniles: 15-30 large discoid roaches per feeding, daily. Supplement with superworms, hornworms, and occasional snails for variety.
• Sub-adults: 20-40 large roaches per feeding, every other day. Begin reducing rodent offerings if they were part of the diet.
• Adults: 20-50 large roaches per feeding, 3-4 times per week. Supplement with hard-boiled eggs (with shell for calcium), occasional lean whole prey, and gut-loaded insects.

A lean savannah monitor is a healthy savannah monitor. If you can see a slight outline of ribs and the belly doesn't drag, your animal is at a healthy weight. If the belly is round and distended, cut back on feeding frequency immediately.

Ackie Monitors (Varanus acanthurus)

Ackies are smaller monitors that thrive on insect-based diets throughout their lives.

• Juveniles: 10-20 medium to large roaches per feeding, daily
• Adults: 10-25 large roaches per feeding, every other day

Ackies are active, lean monitors that rarely develop the obesity issues of savannah monitors. They're enthusiastic eaters and excellent candidates for a roach-based diet.

Black-Throat Monitors (Varanus albigularis)

Black-throats are large, powerful monitors that need significant protein during growth.

• Juveniles: 20-40 large roaches per feeding, daily
• Sub-adults and adults: 30-60 large roaches per feeding, 3-4 times per week, supplemented with other whole prey items

Adult black-throat monitors are large enough that discoid roaches alone may not provide sufficient food volume. Supplement with other protein sources including lean whole prey, eggs, and large invertebrates.

Argentine Tegus (Salvator merianae)

Tegus are omnivores with enormous appetites, especially during their spring and summer active season.

• Juveniles: 20-40 large roaches per feeding, daily during growth season. Tegus grow fast and eat voraciously.
• Sub-adults: 30-50 large roaches plus fruits and vegetables, every other day
• Adults: 30-50+ large roaches plus fruits, vegetables, eggs, and occasional whole prey, 3-4 times per week during active season. Reduce feeding during brumation period.

Tegus are seasonal eaters — they gorge during warm months and drastically reduce or stop eating during winter brumation. Adjust roach orders accordingly. Florida's large tegu community benefits from locally shipped, legal discoid roaches that arrive fresh in Florida's heat.

Why Roaches Beat Rodents for Monitors

The shift from rodent-based to insect-based diets for monitors is one of the most important developments in modern reptile husbandry. Here's the comparison:

Rodents aren't inherently bad — they provide complete nutrition including organs and bones. But for species like savannah monitors, where obesity kills more captive animals than any other cause, the low-fat profile of discoid roaches makes them a fundamentally safer daily staple.

Gut Loading for Monitors and Tegus

Monitors and tegus have high metabolic demands, which means the nutritional quality of each feeder matters. Gut-load your discoid roaches with:

• Dark leafy greens: Collard greens, mustard greens, dandelion greens — high calcium
• Orange vegetables: Butternut squash, sweet potato, carrots — vitamin A
• Protein supplements: A small amount of high-quality dog food in the roach bin ensures the roaches themselves have adequate protein to pass along

At All Angles Creatures, every roach we ship is already gut-loaded. But if you're holding roaches for more than a couple of days before feeding, continue the gut-loading at home to maintain maximum nutritional value.

Bulk Ordering for Big Appetites

Monitors and tegus eat a lot of roaches. A single juvenile savannah monitor can go through 150+ large roaches per week. For keepers with multiple large lizards, individual bag purchases don't make financial sense.

We offer bulk discoid roaches at volume pricing designed for exactly this situation. Whether you're feeding a colony of Ackies, a growing tegu, or a roomful of savannah monitors, bulk ordering reduces your per-roach cost and ensures you always have feeders on hand.

The Complete Monitor/Tegu Feeding Strategy

• Primary staple: Large discoid roaches (gut-loaded, calcium-dusted)
• Secondary protein: Superworms, hornworms, silkworms for variety
• Calcium boost: BSFL, hard-boiled eggs with shell, BSFL
• Occasional whole prey: Appropriately sized rodents once every 1-2 weeks (not as a staple)
• For tegus: Add fruits (berries, mango, banana) and vegetables (squash, greens) as part of their omnivore diet

Feed your monitors and tegus the way nature intended — with high-protein, low-fat invertebrate prey. Browse our monitor and tegu feeder collection for gut-loaded discoid roaches shipped with our live arrival guarantee.

— Matt, Founder, All Angles Creatures