A smooth body without a dorsal fin,
surfacing briefly before slipping back beneath the water.
The finless porpoise is a small cetacean native to East Asian coastal waters, including Korea. Quiet and elusive, it plays a crucial role in coastal ecosystems despite being unfamiliar to many people.

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🧬 What Is a Finless Porpoise?

The finless porpoise belongs to the porpoise family (Phocoenidae), not the dolphin family. Although it resembles dolphins, it has distinct characteristics that set it apart.

• Class / Order / Family: Mammalia / Cetacea / Phocoenidae
• Key traits
  • No dorsal fin
  • Small, rounded head
  • Extremely cautious and shy behavior
  • Preference for coastal and estuarine waters

👉 Sometimes nicknamed the “smiling porpoise,”
it actually lives a very secretive lifestyle.

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🌍 Distribution & Habitat

Finless porpoises are concentrated in East Asian waters.

• Main range
  • West and South Seas of Korea
  • Coastal waters of China
  • Parts of Japan
• Habitats
  • Shallow coastal waters
  • Estuaries (where rivers meet the sea)
  • Bays and inlets

🌊 They favor waters close to human activity rather than the open ocean.

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👀 Appearance & Physical Characteristics

• Body length: About 1.5–2 m (5–6.5 ft)
• Weight: About 30–50 kg (66–110 lb)
• Body shape
  • Rounded and compact
• Back
  • No dorsal fin
  • A ridge with tiny bumps along the back
• Color
  • Gray to dark gray

✨ The absence of a dorsal fin is the easiest way to identify this species.

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🍽️ Diet & Feeding Habits

The finless porpoise is a carnivorous marine mammal.

Main foods

• Small fish
• Squid
• Shrimp
• Other crustaceans

👉 It relies on echolocation to hunt efficiently in murky coastal waters.

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🧠 Behavior & Personality

• Temperament
  • Extremely shy and cautious
• Social structure
  • Solitary or small groups (2–5 individuals)
• Surfacing behavior
  • Rarely leaps out of the water
  • Surfaces quietly to breathe, then disappears

🐬 Very different from the playful, acrobatic dolphins often seen in shows.

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🐣 Reproduction & Lifespan

• Gestation period: About 10–11 months
• Birth
  • Usually a single calf
• Parental care
  • Long-term care provided by the mother
• Lifespan
  • Approximately 20–30 years

👉 Low reproductive rates make population recovery very slow.

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🌱 Ecological Role

Finless porpoises are important predators in coastal ecosystems.

• Regulate fish populations
• Maintain balance in the marine food web
• Serve as indicators of coastal ecosystem health

🌍 Seas where finless porpoises thrive are generally healthier marine environments.

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⚠️ Threats & Conservation

Finless porpoises face serious threats.

Major threats

• Bycatch in fishing nets
• Collisions with vessels
• Marine pollution
• Coastal development

👉 In Korea, the finless porpoise is designated as a protected endangered marine mammal.

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🧡 Why Finless Porpoises Matter

✔️ A native porpoise species of Korean waters
✔️ Unique dorsal-fin-free body shape
✔️ A keystone species in coastal ecosystems
✔️ At risk without active conservation efforts

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The finless porpoise is:
🐬 A quiet life beneath the waves,
🐬 A neighbor living close to humans yet rarely seen, and
🐬 A symbol of the seas we are responsible for protecting.

Its brief, gentle surfacing is a reminder
that our coastal waters are still alive—
and that their silence deserves our attention and care 🌊🐬