Hercules Beetle

Quick Take

• The Hercules beetle's larva can actually be larger than the adult, and that is not even the strangest part of its life cycle. Explore the life cycle →
• Its wings change color based on one environmental factor, and the shift is dramatic enough to make it look like a different beetle entirely. See the color change →
• Male Hercules beetles use their iconic horns for one specific purpose, and the fights can end badly for more than just the loser. See the horn combat facts →
• This beetle spends the vast majority of its life in a form most people would never recognize or ever want to hold. See the larval stage →

The Hercules beetle is one of the world’s largest insects, and it is not just large. The males have long horns that grow from their heads and the middle of their bodies. They come together to resemble pincers or a claw.

The larva, which is curved and white or yellow with a black head, may even be bigger than the adult, but larvae lose some weight during pupation. The Hercules beetle also flies, though clumsily. It’s one of the biggest flying insects as well.

5 Incredible Hercules Beetle Facts

• The Hercules beetle spends most of its life as a larva. It can take a larva, or grub, 12 to 18 months to turn into an adult, while a captive adult only has a lifespan of three to six months. However, some people claim that a well-cared-for Hercules beetle can have a lifespan of as much as a year.
• Only the males have trademark horns. They use them to fight other males during the breeding season.
• The larva of a Hercules beetle can grow 4.5 inches long and weigh over 100 grams. They are good sources of protein and are often eaten. People season them, wrap them in banana leaves, then roast them over a fire.
• The beetle is a type of dynastine scarab, which means it is big and has a robust body, clubbed antennae, and horns. The colors of their carapaces can have a metallic glint to them. Relatives of the Hercules beetle include the eastern Hercules beetle, which is not a subspecies but an entirely different species found in the eastern United States. The eastern Hercules beetle, Dynastes tityus, is smaller than Dynastes hercules, and its horns are not as spectacular.
• The color of the beetle’s hard front wings, or elytra, changes with humidity. If it’s dry, the elytra are yellow or green, but when humidity is high, they turn black.

Evolution and Origins

Evolution involves changes that lead to the emergence of new species, their environmental adaptation, and eventual extinction. Every species has its roots in evolution.

The Hercules Beetle’s huge horns most likely evolved as a result of sexual selection, which is a powerful driving factor. Females selectively bred for larger and larger horns over time because they gave sexual preference to males with larger horns that could push aside rival males.

The Lesser Antilles, Central America, and South America are home to the Hercules beetle (Dynastes hercules), a species of rhinoceros beetle. It is one of the biggest flying insects on the planet and the longest type of beetle that is still alive.

Species, Types, and Scientific Names

The Hercules beetle is a type of rhinoceros beetle in the subfamily Dynastinae, and its scientific name is Dynastes hercules. Dynastes is Greek for ‘master, lord, or ruler,’ and hercules comes from the Greek demigod of the same name who was known for his immense strength. There are at least 10 subspecies, though biologists don’t agree on all of them. They are:

• Dynastes hercules hercules
• D. hercules ecuatorianus
• D. hercules lichyi
• D. hercules morishimai
• D. hercules occidentalis
• D. hercules paschoali
• D. hercules reidi
• D. hercules septentrionalis
• D. hercules takakuwai
• D. hercules trinidadensis

Because of its horns, The Hercules beetle is therefore also classified as a rhinoceros beetle.

Appearance

The appearance of the male beetle is unmistakable, with its claw-like horns that may be as long as its body. The horn that comes from the animal’s body is longer than the one that comes from its head, and both have teeth. The hornless female looks like a regular scarab beetle, with a heavy body. Her elytra are mostly brown or black, and the rest of her body is black. Sometimes the elytra have a metallic sheen that is a distinguishing trait of scarab beetles.

Hercules beetles mate in the rainy season of their native country, which runs from midsummer to early winter. Males famously fight to mate with females using their horns and can not only damage each other but also damage the female they are fighting over.. In the wild, the winner probably simply pushes the loser off of a tree limb.

The female is gravid for about a month before she lays as many as 100 eggs. She’ll deposit them either on the ground or in rotting wood. It takes around 27 days for the eggs to hatch. When they do, the larvae eat rotting wood and molt three times until they reach tremendous size. Then, they pupate and stay in that stage for around 32 days before the adult ecloses.

Though this scarab is native to Central America, South America, and islands in the Caribbean such as Trinidad and Tobago, it is sold around the world as a pet, often for very high prices. It is especially popular for terrariums in Japan and is considered a good luck charm.

The Hercules beetle can fly, though not very efficiently. It is sometimes seen flying around street lights, as it is nocturnal. The beetle makes a huffing sound if it’s picked up or bothered and also emits a foul odor.

Habitat

These beetles are naturally found in rainforests, whether they are in the mountains or in the lowlands. The huge grubs of these rhinoceros-type beetles live in the rotting wood that they eat, while the adults hide under leaf litter and inside logs.

Life Cycle

Little documented information exists about the life cycle of the Hercules beetle. A lot of knowledge has been gained through observations of captive-bred populations of these interesting creatures.

The mating season for adult beetles occurs during the rainy season (July through December). Females have an average gestation period of about 30 days from copulation to egg-laying. These beetles may lay up to 100 eggs on the ground or within deadwood. The eggs have an incubation period of about 27 days before they begin to hatch.

Once hatched, the larvae may live up to two years. They will also go through three larval stages known as instars. The larvae are yellow with a black head, and they can grow up to 4.3 inches (11 cm) in size. After the third stage, the pupal stage begins and lasts about 30 to 32 days. The Hercules beetle will then transition into adulthood and will live for three to six months in captivity.

Diet

Like other rhinoceros beetles, Hercules beetles eat fruit, especially fruit that has fallen from the tree and rotted a bit, which makes it easier for the insect’s chewing mouthparts to handle. Where they live, the fruits are often mangoes and other tropical fruit. They’ll also eat rotting wood, like their larvae do, and other rotting plant material. In captivity, Hercules beetles are often fed fresh fruit such as grapes, as well as high-protein beetle jelly.