Caterpillar-hunter vs Red-billed Duck

Calosoma inquisitor compared with Anas erythrorhyncha

Key Differences

• Caterpillar-hunter is Near Threatened while Red-billed Duck is Least Concern.

Taxonomic Classification

Rank	Caterpillar-hunter	Red-billed Duck
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Insecta (Insects)	Aves (Birds)
Order	Coleoptera (Beetles)	Anseriformes (Anseriformes)
Family	Carabidae	Anatidae
Genus	Calosoma	Anas
Species	Calosoma inquisitor	Anas erythrorhyncha

Evolutionary Relationship

Caterpillar-hunter and Red-billed Duck share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Caterpillar-hunter

NT — Near Threatened

Red-billed Duck

LC — Least Concern

Physical Characteristics

Attribute	Caterpillar-hunter	Red-billed Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Caterpillar-hunter

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Red-billed Duck

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found across Europe (6 countries) and South America (Ecuador).

Caterpillar-hunter

The Caterpillar-hunter (Calosoma inquisitor) is a species in the genus Calosoma. It is currently classified as Near Threatened on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

Red-billed Duck

Red-billed Duck (Anas erythrorhyncha) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇳🇴 Norway