American Brook Lamprey vs Emperor Penguin

Lethenteron appendix compared with Aptenodytes forsteri

Key Differences

• American Brook Lamprey is Least Concern while Emperor Penguin is Near Threatened.

Taxonomic Classification

Rank	American Brook Lamprey	Emperor Penguin
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Petromyzonti (Petromyzonti)	Aves (Birds)
Order	Petromyzontiformes (lamprey)	Sphenisciformes (Penguins)
Family	Petromyzontidae	Spheniscidae (Penguins)
Genus	Lethenteron	Aptenodytes (Great Penguins)
Species	Lethenteron appendix	Aptenodytes forsteri

Evolutionary Relationship

American Brook Lamprey and Emperor Penguin share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

American Brook Lamprey

LC — Least Concern

Emperor Penguin

NT — Near Threatened

Population: ~595.0K

Trend: Stable →

Physical Characteristics

Attribute	American Brook Lamprey	Emperor Penguin
Diet	—	Carnivore
Average Lifespan	—	20 years
Average Length	—	1.1 m
Average Weight	—	40.0 kg

Habitat & Geographic Range

American Brook Lamprey

Habitat

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

Range

Found in United States.

Emperor Penguin

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, 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 Norway. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

American Brook Lamprey

The American Brook Lamprey (Lethenteron appendix) is a species in the genus Lethenteron. It is currently classified as Least Concern on the IUCN Red List. Native to North America, inhabiting ecosystems characteristic of the region.

Emperor Penguin

The world's largest penguin, emperor penguins stand up to 1.2 meters and weigh 45 kg, inhabiting the Antarctic continent in some of the most extreme conditions on Earth. They breed in midwinter darkness at temperatures below -60°C, with males incubating single eggs on their feet under a brood pouch for 65 days while females are at sea. Their huddling behavior — cycling individuals through the warm center of thousands-strong groups — is a masterclass in cooperative survival.