Along quiet shorelines where waves settle,
a gull with a distinctive black band at the tip of its tail sweeps across the sky.
The black-tailed gull is one of the most familiar seabirds along the Korean coast and nearby islands—
a symbol of island ecosystems and a constant presence in coastal scenery.

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🧬 What Is the Black-tailed Gull?

The black-tailed gull is a medium-sized member of the gull family,
named for the bold black band at the end of its tail, its most recognizable feature.
It breeds along East Asian coasts and is protected in Korea as a Natural Monument.

• Class / Order / Family: Aves / Charadriiformes / Laridae
• Key traits
  • Distinct black tail band
  • White body with gray wings
  • Colonial breeding
  • Strong territorial behavior

👉 Often described as “the face of Korea’s coastal gulls.”

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🌍 Distribution & Habitat

The black-tailed gull is centered in East Asia.

• Range
  • Korean Peninsula (coasts and islands)
  • Japan
  • Eastern China
• Habitats
  • Rocky islets and uninhabited islands
  • Coastal cliffs
  • Nearshore waters

🌊 Large breeding colonies form on islands with minimal human disturbance.

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👀 Appearance & Physical Characteristics

• Body length: About 45–50 cm (18–20 in)
• Wingspan: About 120–130 cm (47–51 in)
• Distinctive features
  • White body and gray wings
  • Yellow bill with a red spot near the tip
  • Clear black band on the tail
  • Broad, powerful wings

✨ The tail pattern makes it easy to identify in flight.

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🧠 Behavior & Social Life

Black-tailed gulls are highly social birds.

• Prefer colony living
• Become notably aggressive during breeding season
• Use group defense near nests
• Communicate loudly and frequently

🕊️ Intruders near nesting areas are often met with warning dives.

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🍽️ Diet & Feeding Habits

They are omnivorous, leaning carnivorous.

Main foods

• Fish
• Squid
• Crustaceans
• Marine invertebrates
• Fishery discards

👉 They act as both predators and cleaners within the marine ecosystem.

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🐣 Breeding & Chick Rearing

• Breeding season: Spring to summer
• Nesting
  • Simple ground nests on islands
• Clutch size: 1–3 eggs
• Parental care
  • Both parents incubate and feed chicks
  • Strong nest defense

🐣 Chicks rely heavily on parental protection early on.

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🌱 Ecological Role

• Helps regulate marine prey populations
• Contributes to nutrient cycling on islands
• Serves as an indicator of coastal ecosystem health

🌍 Population changes can reflect broader shifts in nearshore environments.

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⚠️ Threats & Protection

• Disturbance of breeding sites
• Marine pollution
• Declines in fish stocks

👉 In Korea, colonies are monitored and access is restricted during breeding to protect the species.

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🧡 Why the Black-tailed Gull Is Special

✔️ An iconic coastal gull of Korea
✔️ Unique black tail band
✔️ Strong colony defense behavior
✔️ A keystone seabird for island ecosystems

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The black-tailed gull is:
🕊️ A bridge between sea and island,
🕊️ A guardian of coastal ecosystems,
🕊️ A defining voice of Korea’s seaside landscapes.

The sound of gull calls and the sight of a black-tailed gull lifting off above the waves quietly remind us that our coasts remain shared spaces—where nature and people still meet.