common bottlenose dolphin vs Common Seal

Tursiops truncatus compared with Phoca vitulina

Key Differences

common bottlenose dolphin is Least Concern while Common Seal is Near Threatened.
common bottlenose dolphin is 3.8x heavier than Common Seal.
common bottlenose dolphin lives longer (45 years vs 30 years).

Taxonomic Classification

Rank	common bottlenose dolphin	Common Seal
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Cetacea (Whales & Dolphins)	Pinnipedia (Seals & Sea Lions)
Family	Delphinidae (Oceanic Dolphins)	Phocidae (True Seals)
Genus	Tursiops (Bottlenose Dolphins)	Phoca (Harbor Seals)
Species	Tursiops truncatus	Phoca vitulina

Evolutionary Relationship

common bottlenose dolphin and Common Seal share a common ancestor at the Class level: Mammalia. (Mammals)

View Class: Mammalia

Conservation Status

common bottlenose dolphin

LC — Least Concern

Population: ~600.0K

Trend: Stable →

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Physical Characteristics

Attribute	common bottlenose dolphin	Common Seal
Diet	Carnivore	Carnivore
Average Lifespan	45 years	30 years
Average Length	3.0 m	1.7 m
Average Weight	300.0 kg	80.0 kg

Habitat & Geographic Range

common bottlenose dolphin

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 12 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Taiwan), Europe (6 countries), and South America (Colombia, Ecuador, Venezuela).

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

common bottlenose dolphin

The most studied and recognized dolphin species, bottlenose dolphins inhabit warm and temperate oceans worldwide, from coastal shallows to the open sea. Highly intelligent with large brains relative to body size, they demonstrate self-recognition, complex communication, and social learning. They live in fluid fission-fusion societies and cooperate to herd fish. A keystone indicator species for marine ecosystem health.

Common Seal

The most widely distributed pinniped, harbor seals inhabit temperate and subarctic coastal waters of both the North Atlantic and North Pacific. Adults reach up to 130 kg and spend roughly equal time at sea hunting fish, squid, and crustaceans and hauling out on beaches or rocks to rest. Their large, expressive eyes are adapted for underwater vision in low light. Harbor seals are a critical food source for orcas, sharks, and polar bears.