In word-chain games like shiritori, you sometimes play using animals as the theme, right?
Knowing lots of animal names can deepen your knowledge and even give you an edge when playing.
So in this article, we’ll be featuring animals that start with the syllable “ko.”
We’ve picked a variety—from animals you often see at zoos to rare ones.
You might discover unexpected facts, like the origins of their names or their characteristics.
Be sure to check out these animal and creature names you can use as prompts or answers in word games!
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- [Trivia] Do you know the answers? A roundup of animal quizzes
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- Animal names that start with “zu.” Perfect for shiritori and word game hints!
- List of animals that start with “n”
- [By character count] Names of animals and living creatures that start with “gi”
- Let's learn animal names! Animal names that start with 'mi'
2 characters (1–10)
Koi (carp)
When it comes to the most well-known freshwater fish, wouldn’t it be the carp? It has appeared in paintings and poetry since long ago, giving a sense of a close relationship with humans.
It often seems to be opening and closing its mouth, and I’ve heard the reason is that carp don’t have a stomach and therefore can’t store food.
koku (swan)
It’s an alternative name for the bird called a swan.
In sources like the Nihon Shoki, it is written as “鵠” and can be read not only as “Koku” but also as “Kugui.”
Flathead (Kochi)
The flathead is a marine fish characterized by a flat body that looks as if it’s been pressed from above.
Its back is camouflaged, and while it may not look very striking, species like the bartail flathead are considered premium ingredients and are popular with anglers.
It’s really fun to learn the names of lesser-known fish.
3 characters (1–10)
koala
The koala is a marsupial native to Australia that primarily eats eucalyptus leaves.
Although it’s a very popular animal thanks to its adorable appearance, it only eats young eucalyptus leaves, so great care must be taken with its captive environment.
Siberian blue robin
The bird covered in vivid blue feathers from its head to its back is the Siberian blue robin.
In Japan, it migrates in for breeding during the summer.
It is a summer visitor seen in Hokkaido and in regions north of central Honshu.
Cobra
The cobra, with its strikingly intimidating posture, leaves a powerful impression.
It is highly venomous and considered so dangerous that it is said to be capable of biting and killing even a large elephant.
4 letters (1–10)
coyote
A relative of the wolf, the smaller coyote.
It is widely distributed across North America, and in professional ice hockey there is even a team named the Arizona Coyotes!



