Gray/Purple Heron vs limestone fern

Ardea cinerea compared with Gymnocarpium robertianum

Key Differences

• Gray/Purple Heron is Least Concern while limestone fern is Critically Endangered.

Taxonomic Classification

Rank	Gray/Purple Heron	limestone fern
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Tracheophyta
Class	Aves (Birds)	Polypodiopsida (Polypodiopsida)
Order	Pelecaniformes (Pelecaniformes)	Polypodiales (Polypodiales)
Family	Ardeidae	Cystopteridaceae
Genus	Ardea	Gymnocarpium
Species	Ardea cinerea	Gymnocarpium robertianum

Conservation Status

Gray/Purple Heron

LC — Least Concern

Trend: Stable →

limestone fern

CR — Critically Endangered

Physical Characteristics

Attribute	Gray/Purple Heron	limestone fern
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).

limestone fern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Distributed across Belgium, Canada, Norway, and Sweden. Currently classified as Critically 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.

Shared Countries

Both species can be found in 3 countries:

🇧🇪 Belgium 🇳🇴 Norway 🇸🇪 Sweden