Silkworms vs Hornworms: Which Feeder Is Better?

Silkworms vs Hornworms: An Honest Comparison

Silkworms and hornworms are both premium feeder insects that occupy a tier above everyday staples like roaches and crickets. They're both soft-bodied, high in moisture, eagerly eaten by most reptiles, and frequently recommended by veterinarians and experienced keepers. But they serve different roles in a feeding rotation, and understanding those differences helps you use each one most effectively.

Nutritional Comparison

The protein content is identical at approximately 9%. Both are primarily hydration feeders — their nutritional value lies more in their moisture, calcium, and fat profiles than raw protein. For protein, your reptile relies on a staple feeder like discoid roaches.

Fat: Silkworms Win

Silkworms at 1% fat are three times leaner than hornworms at 3%. While 3% is still low compared to mealworms (13%) or superworms (18%), for species that are extremely fat-sensitive — particularly chameleons — the difference between 1% and 3% adds up over regular feedings. Silkworms are the leaner choice for long-term supplementation.

Moisture: Hornworms Win (Barely)

Hornworms edge out silkworms on moisture content: 85% vs 83%. The difference is small, and both are excellent hydration feeders. If your primary goal is emergency hydration for a dehydrated reptile, hornworms provide marginally more water per gram. For regular supplemental hydration, either feeder serves the purpose well.

Calcium: Hornworms Win Significantly

Hornworms have a substantially better calcium-to-phosphorus ratio: 3.07:1 vs 0.77:1 for silkworms. This means hornworms naturally contribute to your reptile's calcium balance rather than working against it. At 46 mg calcium per 100g vs 34 mg for silkworms, hornworms deliver more total calcium as well.

For reptiles at risk of metabolic bone disease, or during periods of high calcium demand (growth, egg production), hornworms provide superior calcium support.

Serrapeptase: Silkworms Exclusive

Silkworms contain serrapeptase — a naturally occurring proteolytic enzyme that may support immune function and healthy inflammation response. No other common feeder insect contains this enzyme. Whether serrapeptase provides clinically significant benefits to reptiles is still debated, but it's a unique nutritional dimension that only silkworms offer.

Shelf Life and Storage

This is where the two feeders diverge dramatically in practical terms.

Silkworms can be stored for 1-2 weeks at room temperature (65-75°F) with regular feeding of mulberry-based chow. They grow steadily but manageably, and their growth can be slowed by keeping them slightly cool. With proper care, they're reasonably predictable.

Hornworms are notoriously difficult to manage because they grow explosively fast. A small hornworm can triple or quadruple in size within days at room temperature. This creates a constant race to feed them to your reptile before they outgrow the appropriate prey size. Refrigeration slows their growth but must be managed carefully — too cold and they die, too warm and they're suddenly huge.

For keepers who want a feeder they can store and use over a week or two at a controlled pace, silkworms are significantly more manageable. Hornworms demand immediate attention and rapid use.

Cost

Both silkworms and hornworms are premium-priced feeders — more expensive per unit than roaches, crickets, or mealworms. Pricing varies by supplier, but they're generally in a similar range per worm.

The effective cost per feeding depends on how many you lose to waste. Silkworms' more predictable shelf life means less waste from overgrowth or die-off. Hornworms' rapid growth often results in some worms becoming too large for the intended reptile before they can all be fed, creating waste. In practice, silkworms tend to deliver more usable feedings per order.

Feeding Response

Both feeders trigger excellent feeding responses, but through different mechanisms:

Silkworms have a slow, deliberate, wriggling movement. They grip surfaces with their prolegs and crawl steadily. This movement is particularly effective for chameleons, which prefer to stalk slow-moving prey on branches, and for leopard geckos, which hunt ground-level prey methodically.

Hornworms are bright blue-green and move more actively than silkworms. Their color and motion trigger intense, immediate feeding responses — particularly in bearded dragons and chameleons. Hornworms are the "excitement" feeder that gets even the pickiest reptile lunging across the enclosure.

For stimulating appetite in sick or reluctant eaters, hornworms typically produce a faster, stronger response due to their visual impact. For regular supplemental feeding, both work excellently.

Best Use Cases

Choose Silkworms When:

• You need the lowest possible fat content (1% vs 3%)
• You feed chameleons — ultra-low fat is critical for cham health
• You want a feeder you can store for 1-2 weeks without size management stress
• You value the serrapeptase enzyme for potential immune support
• You need feeders for juvenile or sensitive reptiles that benefit from zero-chitin soft bodies
• You want a reliable regular supplemental feeder for 2-3 feedings per week

Choose Hornworms When:

• You need maximum hydration for a dehydrated reptile
• You want better calcium contribution (3.07:1 Ca:P ratio)
• You need to stimulate appetite in a sick or picky animal quickly
• You can use them within a few days of receiving them
• You want the visual excitement of bright, active prey for enrichment

Best Approach: Use Both

Silkworms and hornworms aren't competitors — they're complements. The ideal feeding rotation includes both, along with a protein staple like discoid roaches:

• 3-4x/week: Discoid roaches (protein staple)
• 2-3x/week: Silkworms (low-fat supplement, serrapeptase)
• 1-2x/week: Hornworms (hydration, calcium, enrichment)

This combination delivers comprehensive nutrition across every macronutrient and micronutrient your reptile needs, with variety that prevents feeding boredom and nutritional gaps.

Browse our silkworm collection for premium, mulberry-fed worms shipped with our live arrival guarantee.

— Matt, Founder, All Angles Creatures