Weißkopf-Seeadler vs Common Water-Nymph

Haliaeetus leucocephalus compared with Najas guadalupensis

Taxonomic Classification

Rank	Weißkopf-Seeadler	Common Water-Nymph
Kingdom	Animalia (Tier)	Plantae (Pflanzen)
Phylum	Chordata (Chordatiere)	Magnoliophyta (Flowering Plants)
Class	Aves (Vögel)	Liliopsida (Monocots)
Order	Accipitriformes (Greifvögel)	Alismatales (Froschlöffelartige)
Family	Accipitridae (Hawks & Eagles)	Hydrocharitaceae
Genus	Haliaeetus (Sea Eagles)	Najas
Species	Haliaeetus leucocephalus	Najas guadalupensis

Conservation Status

Weißkopf-Seeadler

NE — Not Evaluated

Population: ~316.7K

Trend: Increasing ↑

Common Water-Nymph

NE — Not Evaluated

Physical Characteristics

Attribute	Weißkopf-Seeadler	Common Water-Nymph
Diet	Carnivore	—
Average Lifespan	28 years	—
Average Length	90 cm	—
Average Weight	5.0 kg	—

Habitat & Geographic Range

Weißkopf-Seeadler

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and flooded grasslands and savannas, among 10 distinct biome types spanning the Neotropic and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Europe (8 countries), North America (United States), and South America (Ecuador).

Common Water-Nymph

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Widely distributed across Asia (Israel, Taiwan), Europe (4 countries), North America (4 countries), and South America (Brazil, Colombia).

Weißkopf-Seeadler

The national bird of the United States and a symbol of American conservation success, bald eagles have a wingspan of up to 2.4 meters and inhabit forests and wetlands near open water across North America. Powerful aerial predators and scavengers, they specialize in fish but also take waterfowl and carrion. Nearly extinct by the 1960s due to DDT poisoning and hunting, the bald eagle recovered dramatically following pesticide bans and the Endangered Species Act.

Common Water-Nymph

<em>Najas guadalupensis</em>, commonly known as the common water nymph or southern naiad, is a submerged aquatic plant in the family Hydrocharitaceae. Its conservation status is listed as Not Evaluated by the IUCN. The species has an extensive distribution spanning Asia, Europe, and the Americas, where it inhabits a wide range of lentic and lotic freshwater environments including ponds, lakes, slow streams, and irrigation channels. It typically grows fully submerged, rooting in sandy or muddy substrates in water ranging from shallow margins to depths exceeding two meters. The plant is slender and branching, with narrow, finely toothed leaves arranged oppositely or in whorls along the stem. <em>Najas guadalupensis</em> is adapted to a range of water quality conditions and can persist in turbid, nutrient-enriched environments where other aquatic macrophytes cannot. It typically reproduces through both seed and fragmentation, with stem fragments readily establishing new colonies. Pollination occurs underwater, with pollen dispersed directly through the water column. Biological traits including average lifespan, stem length, and mass remain poorly documented in standardized databases. Ecologically, common water nymph provides important submerged habitat structure for fish, invertebrates, and waterfowl, offering spawning substrate, foraging areas, and refuge from predators in the diverse freshwater systems it occupies throughout its broad geographic range.