What Do Giant Isopod Eat
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About this printable What Do Giant Isopod Eat science reading passage, NGSS-aligned (Grade 6)
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What Do Giant Isopods Eat?

Meet the Giant Isopod
Giant isopods are amazing ocean animals that look like enormous pill bugs, or roly-polies. These creatures live deep in the ocean, far below where sunlight can reach. Some giant isopods can grow up to 16 inches long, which is bigger than a football!
Where They Live
Giant isopods live on the ocean floor at depths between 550 and 7,000 feet. Down there, it is very cold and completely dark. Food is hard to find, so animals must be clever to survive.
What They Eat
Giant isopods are scavengers. This means they eat dead plants and animals. One of their favorite meals is a whale fall—when a dead whale sinks to the bottom of the ocean, isopods can feast on it for years! They also eat dead fish, squid, and other slow-moving animals like sea cucumbers and sponges. Sometimes, they catch weak or slow prey. Giant isopods are like the ocean floor’s cleanup crew. They help keep the sea clean by eating dead things.
How They Eat
Giant isopods use their strong jaws to tear food into pieces. Their mouths have four sets of jaws that work together to break down tough food. Because food is so rare in the deep sea, they can go up to 5 years without eating! When food does arrive, they eat as much as they can all at once. This is called a feast-or-famine lifestyle.
Special Adaptations
These animals have amazing adaptations. They have a hard exoskeleton to protect their bodies, and very large compound eyes to help them see in the dark. If they feel threatened, they can curl up into a ball, just like their pill bug cousins.
Why Are They Important?
Giant isopods are decomposers. By eating dead plants and animals, they recycle nutrients back into the ocean. This helps other animals survive and keeps the ocean healthy.
Interesting Fact:
Giant isopods are related to shrimp and crabs—and in some countries, people even eat them as food!
Comprehension quiz (8 questions)
1. How big can giant isopods grow?
2. Where do giant isopods live?
3. What is a whale fall?
4. Why can isopods go 5 years without food?
5. What do isopods use to eat tough food?
6. How do isopods help the ocean?
7. Is a giant isopod a scavenger? (True/False)
8. What does 'exoskeleton' mean?
Perfect for the way you teach
- Build comprehension skills
- Auto-graded quiz
- Differentiated reading
- Read together at home
- Improve fluency
- Quiet reading time
- Reading curriculum support
- Independent practice
- Track Lexile growth


