Gray/Purple Heron vs Rootless Duckweed

Ardea cinerea compared with Wolffia arrhiza

Key Differences

Gray/Purple Heron is Least Concern while Rootless Duckweed is Endangered.

Taxonomic Classification

Rank	Gray/Purple Heron	Rootless Duckweed
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Aves (Birds)	Liliopsida (Monocots)
Order	Pelecaniformes (Pelecaniformes)	Alismatales (Alismatales)
Family	Ardeidae	Araceae
Genus	Ardea	Wolffia
Species	Ardea cinerea	Wolffia arrhiza

Conservation Status

Gray/Purple Heron

LC — Least Concern

Trend: Stable →

Rootless Duckweed

EN — Endangered

Physical Characteristics

Attribute	Gray/Purple Heron	Rootless Duckweed
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).

Rootless Duckweed

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, temperate broadleaf and mixed forests, and temperate coniferous forests, among 4 distinct biome types spanning the Indomalayan and Oceanian and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Japan), Europe (10 countries), North America (Canada), and South America (Brazil). Currently classified as Endangered 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.