# Assassin Bug — Facts, Threats & Conservation

*Family Reduviidae — over 7,000 described species worldwide*

> Assassin bugs (family Reduviidae) are predatory true bugs that stab prey with a curved rostrum and inject digestive saliva; over 7,000 species exist worldwide, some stacking ant corpses on their backs for camouflage, and most are not individually assessed on the IUCN Red List.

**IUCN status:** Not Evaluated as a family — predatory bugs; some species bite painfully  ·  **WARN range:** Worldwide in temperate and tropical regions, Gardens, woodland and scrub

## Quick facts
| Fact | Value |
| --- | --- |
| Feeding | Predatory — pierce prey with rostrum |
| Famous behaviour | Ant corpse stacking in Acanthaspis |
| Size range | Few mm to about 4 cm |
| Garden role | Beneficial predator of pest insects |
| Medical subgroup | Triatomines transmit Chagas in Americas |
| IUCN status | Not Evaluated for most species |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Insecta
- **Order:** Hemiptera
- **Family:** Reduviidae
- **Subfamily note:** Triatominae — blood-feeding kissing bugs of medical importance
- **Described species:** Over 7,000 worldwide

## Conservation status
- **Status:** Not Evaluated
- **Population:** Not applicable at family level
- **Trend:** Unknown; reduced locally by pesticides
- **Assessed:** Most species not assessed
- **CITES:** Not listed
- Assassin bugs are ecologically valuable predators. Broad insecticide use removes them alongside target pests.

## Key facts: Assassin Bug
- Assassin bugs (Reduviidae) are predatory true bugs with a curved rostrum used to stab and digest prey.
- Some Acanthaspis species stack empty ant exoskeletons on their backs — possible camouflage against jumping spiders.
- Most garden assassin bugs are beneficial predators of pest insects.
- Triatomine 'kissing bugs' are reduviids that feed on vertebrate blood and transmit Chagas disease in the Americas — a distinct medical subgroup.
- Bites from large temperate species such as wheel bugs are painful but not usually dangerous to healthy adults.
- Most species lack IUCN assessments; family is widespread and ecologically important as invertebrate predators.

## Stab, inject, suck
Reduviids are hemipterans — true bugs with sucking mouthparts. The rostrum folds into a groove on the ventral head and extends forward to pierce prey. Saliva contains enzymes that predigest tissue; the bug then sucks the liquefied meal. Forelegs are often thickened for grasping.

Ambush species wait on flowers or leaves; active hunters track prey through vegetation. Assassin bugs are slow compared with wasps but overpower insects their own size or larger through grip and venomous saliva. Garden species reduce caterpillars, beetles and other plant pests without pesticide.

## The ant corpse backpack
Researchers documented Acanthaspis species pinning ants, feeding, and gluing the drained exoskeletons onto the dorsal surface with sticky secretions. The stack grows with each kill. Experiments suggest jumping spiders — visual hunters — hesitate to attack bugs wearing ant armour, while unadorned assassin bugs are taken more readily.

Whether the stack mimics ants chemically, visually or both remains debated. The behaviour is one of the more macabre examples of invertebrate tool use and remains a standard teaching case in entomology courses.

## Kissing bugs versus garden assassins
Triatominae are blood-feeding reduviids of the Americas that bite sleeping humans near the mouth — hence 'kissing bug'. They transmit Trypanosoma cruzi, causing Chagas disease. That medical story applies to a specific subfamily, not to European garden reduviids.

Conflating all assassin bugs with kissing bugs produces unnecessary fear in regions where triatomines do not occur. Identification matters: triatomines are often flattened, kinked at the rostrum, and associated with rural housing in Latin America.

## Bites, handling and status
Large species such as the North American wheel bug bite defensively if grabbed. Pain can be sharp and persist for days but is not equivalent to venomous spider envenomation for most people. Avoid handling; observe in situ.

Reduviidae as a whole is Not Evaluated at family level. Pesticide use and habitat loss reduce predatory bug communities alongside other invertebrates. Assassin bugs are net beneficial in gardens — indiscriminate spraying removes them with pests.

## What WARN does
WARN publishes accurate invertebrate education that separates beneficial garden predators from medically significant subgroups. Assassin bugs reduce pest insects; only a blood-feeding lineage in the Americas carries Chagas risk.

If this guide helps you understand wildlife and the pressures it faces, a gift to WARN supports habitat protection and free public education in our partner countries.

## Frequently asked questions: Assassin Bug
### What do assassin bugs eat?
Other insects and arthropods — caterpillars, beetles, flies, ants and similar prey — stabbed with the rostrum and digested with injected saliva. Blood-feeding triatomines are an exception in the Americas.

### Where do assassin bugs live?
Worldwide in gardens, woodland, scrub and tropical forest. They hunt on vegetation, flowers and ground litter depending on species.

### Are assassin bugs dangerous?
Most garden species bite only if handled and cause local pain. Triatomine kissing bugs in the Americas feed on blood and can transmit Chagas disease — a different subgroup from typical European predators.

### How long do assassin bugs live?
Typically one season to about a year depending on species and climate — egg, nymph stages through several moults, then adult. Exact lifespan varies widely across 7,000+ species.

### How big are assassin bugs?
From a few millimetres to roughly 4 cm in large species such as wheel bugs. Body is usually elongated with long legs; rostrum visible folded under head.

### Why do some assassin bugs carry ant corpses?
Some Acanthaspis species stack drained ant exoskeletons on their backs, possibly camouflaging them against visual predators such as jumping spiders.

### Are assassin bugs endangered?
Most species are not assessed on the IUCN Red List. They remain common in suitable habitat; pesticide use reduces populations locally alongside other predatory insects.

## Sources
- [Animal Diversity Web — Reduviidae](https://animaldiversity.org/accounts/Reduviidae/)
- [Jackson and Pollard — corpse-carrying behaviour in Acanthaspis](https://www.nature.com/articles/37771)
- [Centers for Disease Control — Triatomine bugs and Chagas](https://www.cdc.gov/parasites/chagas/)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/assassin-bug