common bottlenose dolphin vs Nile Crocodile

Tursiops truncatus compared with Crocodylus niloticus

Key Differences

Nile Crocodile is 2.5x heavier than common bottlenose dolphin.
Nile Crocodile lives longer (70 years vs 45 years).

Taxonomic Classification

Rank	common bottlenose dolphin	Nile Crocodile
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Reptilia (สัตว์เลื้อยคลาน)
Order	Cetacea (Whales & Dolphins)	Crocodylia (Crocodilians)
Family	Delphinidae (Oceanic Dolphins)	Crocodylidae (Crocodiles)
Genus	Tursiops (Bottlenose Dolphins)	Crocodylus (True Crocodiles)
Species	Tursiops truncatus	Crocodylus niloticus

Evolutionary Relationship

common bottlenose dolphin and Nile Crocodile share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

ดู: Phylum: Chordata

Conservation Status

common bottlenose dolphin

LC — Least Concern

Population: ~600.0K

Trend: Stable →

Nile Crocodile

LC — Least Concern

Population: ~500.0K

Trend: Stable →

Physical Characteristics

Attribute	common bottlenose dolphin	Nile Crocodile
Diet	Carnivore	Carnivore
Average Lifespan	45 years	70 years
Average Length	3.0 m	5.0 m
Average Weight	300.0 kg	750.0 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).

Nile Crocodile

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Distributed across Egypt, Kenya, Madagascar, South Africa, and Tanzania.

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.