Goliathus goliatus

About Goliathus goliatus

Goliathus goliatus is one of the heaviest insects on Earth, with males reaching 60–110mm and with larvae commonly reaching 80g or more. Native to tropical Africa, adults have striking brown and white patterning on the elytra. Males possess a Y-shaped cephalic horn.

We are blunt about this species: Goliathus has one of the highest mortality rates of any captive beetle. Larvae are unusually demanding and die readily from incorrect feeding, temperature fluctuations, or bacterial infection. Many experienced keepers lose entire clutches. This is genuinely an expert-only species — if you have not successfully raised Mecynorrhina or Chelorrhina through multiple generations, you are not ready for Goliathus.

Larval care — the critical difference

Unlike most cetoniine beetles, Goliathus larvae require protein supplementation in addition to their flake soil substrate. In the wild, they are thought to be partially predatory or to feed on protein-rich organic matter. Without protein, larvae grow slowly and often die.

• Base substrate: fermented hardwood flake soil, kept moist
• Protein supplement: high-quality dry dog or cat food (high protein, low fat) offered regularly
• Some breeders use fish flakes or specialised beetle protein mixes
• House larvae strictly individually — they are cannibalistic
• Maintain 25–27°C consistently — temperature drops are often fatal
• Hygiene is critical: remove uneaten protein food within 24 hours to prevent bacterial bloom

The larval period is relatively short (4–6 months) compared to other large beetles, but the speed of growth means that any problems escalate quickly. Larvae that stop eating or become sluggish rarely recover.

Pupation occurs in a large cell made from compacted substrate. The same rule applies as with all beetles: never disturb a pupal cell. The pupal stage lasts 4–6 weeks.

Adult enclosure & feeding

Adults need a warm, well-ventilated enclosure with bark for climbing and 8–10cm of coconut fibre. Provide beetle jelly and ripe fruit (banana, mango, fig). Adults are active flyers and strong — a secure lid is essential.

Honest assessment

Expect losses. Even experienced breeders report 50% or higher larval mortality. The combination of protein requirements, temperature sensitivity, and susceptibility to bacterial infection makes Goliathus uniquely challenging. Start with a group of larvae rather than a single one, and do not be discouraged by failures — they are part of working with this genus.