Questions & Answers about Kiboko yuko mtoni karibu na mamba.
Because yuko is used to say where someone or an animal is. It means something like is located / is there.
By contrast, ni is used to identify or classify something:
- Kiboko ni mnyama = The hippo is an animal
- Kiboko yuko mtoni = The hippo is in the river
So in this sentence, yuko is the natural choice because the sentence is about location.
That is a very common question. Even though kiboko has the shape of a ki-/vi- noun, animals are often treated with animate agreement in Swahili, especially when talking about them as living beings.
So:
- yuko = animate singular, used naturally for an animal here
A learner can think of it this way: when the noun refers to a living creature, Swahili often uses the same agreement pattern it uses for people.