The Hippopotamus with Hiccups

The Story:

There was once hippopotamus called Happy who lived on the banks of a big river Africa, where the sun shines every day. All his friends and relations lived there, too, but no one was quite so cheerful as Happy.
Every day the hippos played together in the muddy water, splashing and laughing, or chatting with the animals who came down to the river to drink.
Then, one day, as all the hippos lay dozing in the river, Happy lifted his head out of the water to yawn, but ---------- ".... HIC!"
He tried to yawn again but he could not. He had hiccups!!  "Hic-cup"

Some Questions About This Stories:

1) How many hippos are there?

2)Is it sunny day?

3)Where did Happy lived?

4)Why did the other animal come down there?