Once upon a time, deep in the ocean, there lived a small crustacean named Krilly. Krilly was a curious little creature who loved to explore the vast ocean and discover new things. One day, while swimming near the surface, Krilly came across a group of strange creatures. They were big and had long white fins on their heads. Krilly soon learned that these creatures were called cetaceans, and they were whales.

The whales were using a special tool called sonar to find food. Sonar sends out sound waves at a high frequency, which bounce off objects in the water and tell the whales where to find their next meal. Krilly watched in amazement as the whales used their baleen, a special filter-like structure in their mouths, to strain out tiny creatures called plankton from the water.

Krilly soon realized that plankton was the main food source for many of the ocean's creatures. However, Krilly and his fellow crustaceans were not able to eat plankton because they were too big. Krilly was determined to find a way to eat plankton just like the whales.

After some experimentation, Krilly discovered that by controlling his buoyancy, he could swim up to the surface and scoop up plankton with his small claws. He shared this discovery with his friends, and soon all the crustaceans were able to eat plankton just like the whales.

From that day forward, Krilly and his friends were able to thrive in the ocean, thanks to their newfound ability to eat plankton. They lived happily ever after, exploring the ocean and discovering new things every day.

The end.

Reflections

1. What is sonar and how does it work?
2. How did Krilly figure out how to eat plankton?
3. Why was Krilly's discovery important for him and his friends?