Krill Facts for Kids | Antarctic Life Cycle & Activities

How can a small ocean animal help feed a whale? Meet krill! These shrimp-like crustaceans are an exciting starting point for exploring ocean animals, life cycles, and food webs.

This guide introduces krill facts for kids, focusing on Antarctic krill. Use the printable learning resources below to connect animal research with reading, vocabulary, sequencing, and matching activities.

🦐 What Are Krill?

Krill are small marine crustaceans. They are invertebrates, which means they have no backbone. Although they resemble shrimp, krill belong to a different group of crustaceans.

There are many krill species. Antarctic krill, scientifically named Euphausia superba, are especially important in the Southern Ocean.

Begin an investigation with the Krill Animal Research Page Worksheets. Invite children to organize their findings under headings such as appearance, habitat, food, and predators.

🌊 Where Do Antarctic Krill Live?

Antarctic krill live in the Southern Ocean around Antarctica. Sea ice is an important part of their environment, particularly during early life.

For a geography connection, find Antarctica on a globe. Ask children to identify the surrounding ocean and describe how this habitat might differ from a warm coral reef.

What questions do you have about animals living near sea ice?
Where might a small animal find food?
How could seasonal changes affect its habitat?

🌿 What Do Krill Eat?

Antarctic krill eat phytoplankton, including microscopic algae. Their diet can also include other material and small animals. Algae growing beneath sea ice provide an important food source, especially for young krill.

Introduce these vocabulary words during your lesson:

Phytoplankton: tiny drifting organisms that use sunlight to make food.
Consumer: an organism that gets energy by eating other organisms or organic material.
Habitat: the place where an organism lives.

Ask learners to explain why something too small to see easily can still be important to an ocean ecosystem.

🐋 What Eats Krill?

Krill are food for many Antarctic animals, including certain whales, penguins, seals, fish, and squid. They help transfer energy from tiny plankton to larger animals.

A simple food chain to investigate is:

Phytoplankton → Antarctic krill → a krill-eating whale

The arrows show the direction that energy moves as one organism is eaten by another. A food web connects many food chains, showing that animals can have more than one food source.

For a classroom activity, draw a krill in the center of a page. Add its food on one side and several predators on the other, then connect them with arrows.

🔄 The Krill Life Cycle

Antarctic krill develop through several larval stages before becoming juveniles and adults. For an introductory lesson, organize the process into four broad stages:

Egg: The female releases eggs into the water. Antarctic krill eggs sink as they develop.
Larva: After hatching, the young krill develop through several stages while moving toward upper waters.
Juvenile: The young animal increasingly resembles an adult and continues growing.
Adult: Mature krill can reproduce, beginning another life cycle.

These four headings simplify a more detailed process. Scientists use names such as nauplius, calyptopis, and furcilia for different larval stages.

Explore sequencing with the Krill Life Cycle Poster and Cut-and-Paste Activity Worksheets. Ask children to describe the stages shown and explain how the animal changes as it develops.

Use the Krill Life Cycle Montessori 3-Part Cards for vocabulary, recognition, and matching practice.

❄️ Why Is Sea Ice Important to Krill?

The underside of sea ice can support algae that young Antarctic krill eat. This connects their survival with seasonal changes in the icy ocean.

Turn this connection into an inquiry question: How could a change in one part of a habitat affect its animals?

Invite children to draw sea ice, algae, and krill. Ask them to explain the relationships in their picture using the words habitat, food, and consumer.

📖 Read, Research, and Discuss

Bring literacy into your ocean unit with the Krill Reading Passage and Comprehension Questions Worksheets.

After reading, invite learners to:

Share one new fact and explain it in their own words.
Find a detail that helps describe the animal.
Write a question they would like to investigate next.
Explain how krill connect with other ocean organisms.

For an informational writing extension, use the sentence starter: “Krill are small, but they are important because…”

🧩 Krill Learning Activities for Kids

Build a short learning sequence around the question: How does a small animal support a large ocean food web?

Locate: Find Antarctica and the Southern Ocean on a map.
Research: Record facts about Antarctic krill.
Sequence: Discuss the life cycle stages shown in your materials.
Connect: Draw a simple food chain involving krill.
Explain: Write or tell a partner why krill matter.

Explore a coordinated resource option with the Krill Life Cycle 3-in-1 Bundle.

Finish with the Krill Cut-and-Match Ocean Animal Puzzle Printables. Encourage children to describe the visual clues they use to complete each match.

💬 Krill Questions for Kids

Are krill fish?
No. Krill are crustaceans and have no backbone.

Do all krill live in Antarctica?
No. Different krill species live in different parts of the ocean. This guide focuses on Antarctic krill.

What do Antarctic krill eat?
They eat phytoplankton and can use other food sources, including algae beneath sea ice.

Why do scientists study krill?
Krill connect many organisms in Southern Ocean food webs, so understanding them helps scientists study the wider ecosystem.