Buffalo Beetle Larvae: An Easy Feeder for Bioactive Setups

Jumping spiders thrive on variety, and lesser worms — the larvae of the buffalo beetle (Alphitobius diaperinus) — are one of the easiest ways to add it. Small, slow-moving, and genuinely low-maintenance, they're a solid feeder for jumping spiders and tarantula slings alike, and they double as cleanup crew if you're running roach colonies.

Why Lesser Worms Work Well

• Right size for small predators. Measuring roughly 1/2 inch, they're an easy match for jumping spiders and smaller tarantula slings — no oversized prey issue to worry about.
• Nutritious. High in protein and healthy fats, supporting growth and energy without the extreme fat load of a treat-only feeder like waxworms.
• Easier to digest than standard mealworms. They have a softer shell than Tenebrio molitor, which matters less for spiders (who liquefy their food regardless) but still makes them a gentle, low-friction feeder overall.
• Low maintenance, long shelf life. With proper care they hold for weeks — closer to a mealworm's storage profile than a fragile feeder that needs to be used immediately.
• Slow movement, easy target. Their distinctive wobble makes them easy prey, which is exactly what you want when feeding a picky or inexperienced hunter.

How to Feed Them

• Match size to spider. Choose worms proportionate to your spider's size — smaller worms for juveniles, standard size for adults.
• Offer directly. Place a single worm in a shallow dish or straight into the enclosure. They're slow enough that most spiders won't struggle to catch one.
• Nudge if needed. If your spider doesn't show immediate interest, gently nudging the worm to trigger movement often does the trick — jumping spiders hunt on motion.
• Remove anything uneaten after 24 hours. Same rule as most live feeders: don't let it sit in the enclosure indefinitely.
• Portion: roughly 1–2 worms per feeding for an adult spider, adjusted for size and appetite. Rotate lesser worms into a mix with fruit flies or house flies rather than relying on them as the sole feeder.

Storage

For short-term use, lesser worms do fine at room temperature in their substrate. For longer storage:

• Refrigerate — this slows their metamorphosis into beetles significantly, buying you more usable time before the batch ages out.
• Keep the fridge temperature between 42–55°F.
• Use a ventilated container with a secure lid — enough airflow to keep the substrate from going stale, tight enough that nothing wanders off.
• Let them warm to room temperature before feeding — pull what you need ahead of time rather than offering a cold, sluggish worm straight from the fridge.

Breeding Your Own

Lesser worms are simple and cheap to keep going if you want a continuous supply rather than reordering:

• Setup: Keep adult buffalo beetles in the same container as the larvae — they'll continue reproducing as a self-sustaining group.
• Conditions: A warm environment, roughly 75–80°F, with dry, well-maintained substrate (oats work well, with occasional moisture from potato or apple pieces).
• Harvesting: Check the substrate periodically for new larvae and pull out what you need for feeding, leaving the rest of the colony to keep producing.

A Bonus Use: Cleanup Crew

If you keep roach colonies (Dubia, discoid, hissers), lesser worms integrate well as custodians — they help break down waste and shed exoskeletons, which cuts down on mold and odor in the bin. Worth considering even outside of a direct feeding role if you're running a larger feeder setup.