Species Profile
Blakiston's Fish-Owl
Ketupa blakistoni
Quick Facts
Conservation
ENEndangeredAlso known as: Blakiston's Eagle-owl, Bubo blakistoni
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Appearance
Blakiston's Fish-Owl is one of the world's largest owls (second only to the Eurasian Eagle-owl), with a massive, stocky build and prominent ear tufts that typically extend horizontally.
Its plumage is predominantly buff-brown, streaked and mottled with darker colours, providing excellent camouflage against tree bark.
Females are notably larger than males, but both sexes share similar colouration. Juveniles can be distinguished by their whiter feather edges and spots, along with their bluish bill and toes, rather than the grey-horn colouring of adults.
Identification & Characteristics
Colors
- Primary
- Brown
- Secondary
- Buff
- Beak
- Grey
- Legs
- Grey
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Blakiston's Fish-Owls inhabit riparian forests in northeastern Asia, including parts of Russia, China, and Japan. They are closely associated with old-growth forests near clean, fish-rich rivers and streams.
The species is non-migratory, maintaining year-round territories. In Japan, they are found on Hokkaido island, while in Russia, they occur in the Far East regions, including the Primorye and Khabarovsk territories.
Distribution
Diet
As their name suggests, Blakiston's Fish-Owls primarily feed on fish, including salmon and trout. They also consume amphibians, crustaceans, and small mammals.
These owls hunt by perching near water bodies and swooping down to snatch prey from the surface or by wading into shallow water to catch fish with their talons.
Behaviour
This nocturnal hunter is primarily solitary, coming together only during the breeding season. Blakiston's Fish-Owls are known for their unique fishing technique, wading into shallow streams to catch prey with their powerful talons.
They are generally sedentary, maintaining year-round territories along riverbanks.
Calls & Sounds
Blakiston's Fish-Owls produce deep, resonant hooting calls that can be heard over long distances. Their vocalisations are often described as a series of low, booming 'boo-boo-boo' sounds.
During courtship, pairs engage in duet calling, with the male's voice typically lower in pitch than the female's.
Nesting & Breeding
Breeding pairs of Blakiston's Fish-Owls form long-term, monogamous bonds. The breeding season typically begins in late winter to early spring, with courtship involving duet calling between mates.
Nests are usually located in large tree cavities near water bodies, often in old-growth trees. The female lays 1-2 white eggs, which are incubated primarily by her for about 35-37 days.
Both parents care for the young, which fledge after approximately 50-55 days but remain dependent on their parents for several months. Young owls may stay in their parent's territory for up to two years.
Conservation
Blakiston's Fish-Owl is classified as Endangered due to habitat loss, particularly the destruction of old-growth forests near rivers.
Conservation efforts focus on protecting remaining habitats and raising awareness about the species' ecological importance. Artificial nest boxes have been used in some areas to support breeding populations.
Elevation
Sea level to 800 meters
Additional Details
- Predators:
- Adult Blakiston's Fish-Owls have few natural predators due to their large size. However, eggs and young may be vulnerable to martens, foxes, and other large birds of prey.
Birdwatching Tips
- Look for them near rivers and streams in old-growth forests
- Listen for their deep, resonant hooting calls at night
- Search for signs of activity, such as fish remains or large pellets near potential roosting sites
- Be patient and quiet; these owls are shy and easily disturbed
Did You Know?
- Blakiston's Fish-Owl is the second largest owl species in the world.
- They have specialised serrations on their foot pads to help grip slippery fish.
- These owls can catch fish weighing up to 2 kg, nearly half their own body weight.
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