Elephant Beetle
The elephant beetle (Megasoma elephas) is one of the biggest beetles in the world. It is a kind of rhinoceros beetle that lives in the rainforests of Mexico, Central America and northern South America, and the males carry a huge curved horn on their heads.
Elephant beetle Quick Facts
| Common name | Elephant beetle |
| Scientific name | Megasoma elephas |
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Class | Insecta |
| Order | Coleoptera |
| Family | Scarabaeidae |
| Genus | Megasoma |
| Type | Insect (rhinoceros beetle) |
| Diet | Adults drink tree sap and fruit juice; larvae eat rotting wood |
| Habitat | Tropical rainforests |
| Native range | Southern Mexico, Central America and northern South America |
| Size | Males about 7-12 cm long |
| Lifespan | About 3 years in total; adults live a few months |
| Special feature | Males have a long forked head horn |
A giant among beetles
Elephant beetles belong to the scarab family (Scarabaeidae) and the rhinoceros beetle subfamily (Dynastinae). Adult males are usually about 7 to 12 cm long, and the biggest can be a little longer. Females are noticeably smaller and have no horns.
The beetle’s body is black, but it is covered with a fine coat of short yellowish or brownish hairs, especially on the wing covers. These hairs give it a fuzzy, golden-brown look, a bit like suede, and they rub off in patches as the beetle gets older.
Horns for fighting
A male elephant beetle has a long, thick horn that grows from its head and curves upward, splitting into two small points at the tip. It also has shorter, pointed horns on its thorax, the part of the body just behind the head.
Males use their horns to wrestle each other over feeding spots and females. They try to lift or flip their rival off a branch, a bit like two tiny bulldozers pushing each other. The biggest males with the longest horns usually win. Females do not fight in this way and have no horns at all.
Where elephant beetles live
Elephant beetles live in warm, wet tropical forests, from southern Mexico through Central America and into northern South America. They are found in lowland rainforests and nearby areas with plenty of large trees, rotting wood and heavy rainfall.
Adults are mostly active at night. They are strong but noisy fliers and are sometimes attracted to lights.
Warming up
Elephant beetles have a surprising trick. Before flying, they can shiver their flight muscles to warm their bodies up, and scientists have measured their body temperature rising well above the air around them. Their thick coat of hairs may help hold in that heat. This is unusual for a beetle and helps such a heavy insect get ready to fly.
What do elephant beetles eat?
Adult elephant beetles drink sweet liquids. They feed on sap that oozes from trees and from fresh cuts in young branches, and on ripe or fallen fruit. They sometimes chew the bark of twigs to make the sap flow.
The larvae, or grubs, live inside rotting logs and eat the soft, decaying wood. By breaking down dead trees, they help recycle nutrients back into the forest soil.
Life cycle
Like all beetles, elephant beetles go through complete metamorphosis, with four stages: egg, larva, pupa and adult.
- Egg: The female lays her eggs in rotting wood or in the soil near decaying logs. The eggs hatch after a few weeks.
- Larva: The grub is large, white and C-shaped, with a brown head and six short legs. It spends a very long time eating and growing, usually two years or more, and becomes a fat grub that can weigh much more than the adult.
- Pupa: The fully grown larva makes a chamber in the wood or soil and turns into a pupa. This stage lasts several weeks.
- Adult: The adult beetle digs its way out. Adults live for only a few months, long enough to feed, mate and lay eggs.
From egg to adult, the whole life cycle can take about three years or more.
Are elephant beetles pests?
Elephant beetles are not serious pests. Adults may sometimes nibble young twigs or feed on fallen fruit, but they rarely cause much damage. Reports of big beetles damaging fruit crops such as lychee usually involve other rhinoceros beetles, like the ones that feed on lychee fruit in northern Queensland, Australia. Elephant beetles do not live in Australia.
Elephant beetles are harmless to people. They cannot bite or sting, although their spiky legs can grip quite firmly. In some places they are raised as pets, and they are popular with insect collectors.
Fun facts
- Elephant beetles are among the heaviest insects in the world.
- Rhinoceros beetles are some of the strongest animals for their size and can lift many times their own body weight.
- A close relative, the Actaeon beetle (Megasoma actaeon), is even bulkier and is one of the heaviest beetles known.
Elephant beetle FAQs
How big is an elephant beetle?
Male elephant beetles are usually about 7 to 12 cm long, making them one of the largest beetles in the world. Females are smaller and have no horns.
Do elephant beetles bite?
No. Elephant beetles are harmless to people and cannot bite or sting, although their spiky legs can grip tightly.
What do elephant beetles eat?
Adults drink tree sap and juice from ripe or fallen fruit. Their larvae live inside rotting logs and eat the decaying wood.
Why do elephant beetles have horns?
Only males have horns. They use them to wrestle and flip rival males off branches when competing for food and mates.
How long do elephant beetles live?
The whole life cycle takes about three years, but most of that is spent as a larva in rotting wood. Adults live only a few months.
Randi Jones is the owner and founder of the Nature Gift Store, an online retailer specializing in nature-themed gifts, educational science projects, live animal nature kits and real butterfly artwork. A biology graduate who fell in love with insects, she founded the company in 2001 to make active learning about nature fun, accessible and engaging for children and adults. Her store offers real butterfly frames, home and garden decor and educational live animal kits, including ant farms, worm farms, tadpoles, ladybugs and hermit crabs, and she runs a bug museum in Washington featuring live animals like Eddie the Iguana alongside other reptiles and insects.
