pigargo-americano vs Compound Sea Squirt

Haliaeetus leucocephalus compared with Didemnum vexillum

Taxonomic Classification

Rank	pigargo-americano	Compound Sea Squirt
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (cordados)	Chordata (cordados)
Class	Aves (ave)	Ascidiacea (Ascidiacea)
Order	Accipitriformes (Hawks & Eagles)	Aplousobranchia
Family	Accipitridae (Hawks & Eagles)	Didemnidae
Genus	Haliaeetus (Sea Eagles)	Didemnum
Species	Haliaeetus leucocephalus	Didemnum vexillum

Evolutionary Relationship

pigargo-americano and Compound Sea Squirt share a common ancestor at the Phylum level: Chordata. (cordados)

View Phylum: Chordata

Conservation Status

pigargo-americano

NE — Not Evaluated

Population: ~316.7K

Trend: Increasing ↑

Compound Sea Squirt

NE — Not Evaluated

Physical Characteristics

Attribute	pigargo-americano	Compound Sea Squirt
Diet	Carnivore	—
Average Lifespan	28 years	—
Average Length	90 cm	—
Average Weight	5.0 kg	—

Habitat & Geographic Range

pigargo-americano

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).

Compound Sea Squirt

Habitat

Native to Europe and North America and Oceania, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Europe (8 countries), North America (Canada, Mexico, United States), and Oceania and the Pacific (New Zealand).

pigargo-americano

A ave nacional dos Estados Unidos e símbolo do sucesso conservacionista americano, a águia-careca tem uma envergadura de até 2,4 metros e habita florestas e zonas húmidas próximas de águas abertas em toda a América do Norte. Quase extinta na década de 1960 devido ao envenenamento por DDT e à caça, recuperou de forma notável após as proibições de pesticidas e a Lei das Espécies em Perigo.

Compound Sea Squirt

<em>Didemnum vexillum</em>, the compound sea squirt, is a colonial tunicate in the family Didemnidae native to the northwestern Pacific Ocean, widely recognised as one of the most ecologically disruptive marine invasive species globally. It has been introduced through shipping and aquaculture to the coasts of Europe, North America, New Zealand, and other regions, where it forms extensive, rapidly-spreading mats that can smother native benthic communities including rocky reef habitats, shellfish beds, seagrass meadows, and aquaculture equipment. Each colony consists of numerous individual zooids embedded in a tough, gelatinous or leathery tunic that is often cream, pale yellow, or orange in colour. The compound sea squirt is a filter feeder, drawing water through siphons to extract phytoplankton and suspended organic particles. Colonies can fragment and regenerate from small pieces, facilitating rapid spread via anchor chains, boat hulls, and aquaculture gear. The IUCN lists it as Not Evaluated on the global Red List, a reflection of its invasive abundance rather than conservation concern. In its introduced range, <em>Didemnum vexillum</em> is associated with declines in native invertebrate biodiversity and economic losses to shellfish aquaculture. Biological traits including colony growth rates and lifespan vary by environmental conditions; detailed population biology remains an active research area in invasion biology.