On simpler days, he loved to play with his pebble.

But today he sniffed at the water, it felt colder than usual.

Oliver was not the fastest swimmer, but he was the smartest.

He had an idea, to make the brook warmer.

Oliver fetched some stones from the another part of the brook.

He placed them in the colder part, making the water more shallow.

After some time, the sun heated the stones, which made the water warmer.

Oliver was happy, the brook was now warmer.

But he wanted the water to be even warmer.

He fetched even more stones from the highest part of the brook.

He placed them in the brook, now it was even warmer.

Now, Oliver was the happiest, he had made the brook warmer.

He was not the strongest, but he was definitely the smartest otter.