Gray/Purple Heron vs Ko`oko`olau

Ardea cinerea compared with Bidens campylotheca

Key Differences

• Gray/Purple Heron is Least Concern while Ko`oko`olau is Vulnerable.

Taxonomic Classification

Rank	Gray/Purple Heron	Ko`oko`olau
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Aves (Birds)	Magnoliopsida (Dicots)
Order	Pelecaniformes (Pelecaniformes)	Asterales (Daisies & Sunflowers)
Family	Ardeidae	Asteraceae (Daisy Family)
Genus	Ardea	Bidens
Species	Ardea cinerea	Bidens campylotheca

Conservation Status

Gray/Purple Heron

LC — Least Concern

Trend: Stable →

Ko`oko`olau

VU — Vulnerable

Physical Characteristics

Attribute	Gray/Purple Heron	Ko`oko`olau
Diet	Carnivore	—
Average Lifespan	15 years	—
Average Length	95 cm	—
Average Weight	1.5 kg	—

Habitat & Geographic Range

Gray/Purple Heron

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries).

Ko`oko`olau

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and temperate grasslands and steppes, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Turkey. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Gray/Purple Heron

A large, elegant wading bird reaching up to 1 meter in height, gray herons inhabit wetlands, rivers, lakes, and coastal areas across Europe, Asia, and Africa. Patient, solitary hunters, they stand motionless for long periods before striking fish, frogs, and small mammals with lightning-fast dagger bill strikes. They nest colonially in tall trees in rookeries called heronries, sometimes shared with other colonial waterbirds. Widely distributed and of Least Concern globally.