# European rhinoceros beetle (Oryctes nasicornis) > Large European scarab with a single long, curved head horn on males; larvae develop in decaying wood and compost. Source: https://insectscanner.com/species/european-rhinoceros-beetle/ (updated 2026-10-10) ## Is it dangerous? **Non-toxic.** Not venomous and not aggressive. Its strong spiny legs can grip or scratch, and it may pinch gently if handled roughly, but it poses no medical risk. Wash hands after handling. **Pets:** Generally harmless to pets. Large beetles could be chewed by curious dogs or cats, which might cause mild mouth irritation or vomiting from indigestible chitin, but they are not toxic. ## Quick facts - Scientific name: Oryctes nasicornis - Also called: Greater rhinoceros beetle, European rhinoceros scarab - Order: Coleoptera (Beetles) - Family: Scarabaeidae (Scarab beetles) - Size: About 25-40 mm body length - Colours: Dark brown, Blackish brown, Reddish brown - Habitat: Deciduous woodland, hedgerows, parks, gardens with compost heaps, old tree stumps and piles of decaying wood - Range: Widespread across Europe, extending into parts of North Africa and western Asia (including the Caucasus and Anatolia) - Active: Summer months (often June to August); mostly nocturnal but may be seen at dusk or attracted to lights - Lifespan: Adults live a few weeks to a few months; full development from egg to adult typically takes 2-4 years - Effect on plants: Decomposer - Pest: no ## Overview Oryctes nasicornis is a large scarab beetle found across much of Europe and adjacent regions. Males have a prominent curved horn on the head used in fights for mates; females have only a small horn or bump. Adults are mainly active in summer and are attracted to lights. The larvae develop for two years or more in decaying broadleaf wood, compost and rotting tree roots, where they help break down dead wood. This species is not dangerous to people or pets. It is not normally an agricultural pest; its larvae feed on dead and decaying plant material rather than living crops or healthy trees. In some regions populations have declined where dead wood and old stumps are removed from landscapes, but overall it remains widespread in suitable habitats. ## How to identify it Adults are robust, glossy reddish-brown to chestnut, and elongate-oval. Males have a single long, backward-curving horn on the head and a raised ridge on the pronotum; females have only a short horn or bump. The body is smooth and shiny, with strong, spiny legs adapted for digging. Elytra (wing covers) are rounded and cover the abdomen completely. Size and the presence of the horn are the most obvious identifying features. - Male with a single curved horn on the head; female lacks the long horn - Large, glossy chestnut to reddish-brown body with rounded elytra covering the abdomen - Found around decaying wood, compost heaps or attracted to lights in summer evenings ## Lookalikes - **Rhinoceros stag beetle** (Sinodendron cylindricum): Much smaller (about 12-18 mm), black and cylindrical, with a short horn in males; it also breeds in rotting wood. O. nasicornis is far larger and reddish-brown. - **European horned dung beetle** (Geotrupes stercorarius): Geotrupes are more rounded, with different leg structure and are associated with dung rather than decaying wood; they lack the long horn of male Oryctes. ## Life cycle - **Egg:** Females lay eggs in decaying wood, compost or soil rich in rotting plant material. - **Larva (grub):** Large C-shaped white grubs feed within rotting wood and compost for two years or more, overwintering several times before they mature. - **Pupa:** Larvae pupate within a cell in the substrate; pupation lasts weeks to months before the adult emerges. - **Adult (beetle):** Adults emerge in summer, mate, and the life stage typically lasts weeks to a few months while they reproduce. ## Diet and predators - Young eat: Decaying wood, compost, rotting roots and leaf litter - Adults eat: Adults feed little; may feed on tree sap or not feed much while active in summer - Predators of the young: Soil-dwelling predators, beetle-eating birds, mammals such as shrews and hedgehogs, and parasitic wasps and flies - Predators of adults: Birds (e.g. crows), bats at night, mammals such as hedgehogs, and opportunistic invertebrate predators ## Effect on plants and gardens Larvae feed on decaying wood and organic matter, aiding nutrient recycling; adults feed little or not at all (occasionally on tree sap). They do not attack healthy living trees or crops. ## Where and when to find it Look for adults on tree trunks, near sap flows, around porch lights or on roads at dusk; search for larvae in rotting stumps, logs and compost piles. - Best time: June to August, at dusk or during warm nights - Tips: Use a torch at dusk to spot adults near tree trunks or lights. When photographing, handle gently—support the beetle from below and avoid grabbing the horn. ## Fun facts - The male's horn is used in fights to flip rivals rather than to injure seriously. - Despite their fearsome appearance, rhinoceros beetles are harmless to people and help decompose dead wood. - They are strong for their size and can carry many times their own body weight. ## Frequently asked questions ### Are European rhinoceros beetles dangerous? No. They are not venomous and do not bite or sting unless handled roughly; any pinch is mild. ### Do rhinoceros beetles bite? They have mandibles and could give a mild pinch if provoked, but they do not deliberately bite people. ### Why is this beetle in my garden or compost heap? Females lay eggs in decaying wood and rich compost; your compost or old stumps provide perfect habitat for larvae. ### How can I get rid of them? Removal of breeding material (rotting wood, old stumps, exposed compost) reduces local numbers. Hand-picking adults at night or moving compost to disrupt larvae can help. They are beneficial decomposers, so control is usually unnecessary. ### Where do they live and when can I see them? They live in deciduous woodlands, parks and gardens with dead wood or compost. Adults are most visible in summer evenings when attracted to lights. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/82774), [Wikipedia](https://en.wikipedia.org/wiki/European_rhinoceros_beetle). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.