📚 Sea Life
Our oceans cover more than two thirds of the Earth and are home to the most diverse collection of life on the planet. From the sunlit surface to the pitch-black deep sea trenches, extraordinary creatures have adapted to survive in every part of the ocean. Let's meet some of the most amazing!
🦈
Great White Shark
- Can grow up to 6 metres long — longer than a car!
- Has 300 teeth arranged in several rows
- Can smell blood from 5 kilometres away
- Swims at up to 56 km/h in short bursts
- Has been on Earth for over 400 million years
🐬
Bottlenose Dolphin
- One of the most intelligent animals on Earth
- Uses echolocation — clicking sounds — to find fish
- Sleeps with one half of its brain at a time
- Can swim up to 35 km/h
- Lives in social groups called pods
🐙
Octopus
- Has three hearts and blue blood
- Can change colour and texture in less than a second
- Eight arms, each with suction cups for gripping
- Is highly intelligent — can solve puzzles and open jars
- Squirts ink to confuse predators
🪸
Coral Reef
- Home to 25% of all marine species
- Made by tiny animals called coral polyps
- The Great Barrier Reef is 2,300 km long
- Reefs grow just 1–3 cm per year
- Threatened by warming oceans and bleaching
🐋
Blue Whale
- The largest animal ever to have lived on Earth
- Can reach 30 metres long and 180 tonnes
- Heart is the size of a small car
- A baby is born at 7 metres long
- Can eat 4 tonnes of krill in a single day
🦑
Giant Squid
- Can grow up to 13 metres long
- Has the largest eyes of any animal — up to 30 cm wide
- Lives in the deep ocean — rarely seen alive
- Has two longer tentacles and eight shorter arms
- Battles with sperm whales in the deep sea
✨ Amazing Facts
🌊 The Pacific Ocean is larger than all the land on Earth combined!
💡 Some deep-sea fish make their own light — this is called bioluminescence.
🐠 There are over 3,500 species of fish living on coral reefs.
🧊 The Arctic and Antarctic oceans are home to fish with natural antifreeze in their blood.
🔊 Dolphins have their own "names" — unique whistles that identify each individual.
🐢 Sea turtles have been swimming the oceans for over 100 million years.
🤔 Sea Life Quiz
Click each answer to check it instantly!
Question 1 of 6
How do dolphins use echolocation? 🐬
- They use their eyes to see underwater
- They click and listen to the echoes to find fish
- They follow the smell of fish
- They watch other dolphins hunt
Question 2 of 6
How many hearts does an octopus have? 🐙
- One, just like humans
- Two — one for each side
- Three — two pump blood through its gills, one around the body
- Four — one per pair of arms
Question 3 of 6
What is the largest animal ever to have lived on Earth? 🌊
- T. rex dinosaur
- African elephant
- Giant squid
- Blue whale
Question 4 of 6
What percentage of marine species live on coral reefs? 🪸
Question 5 of 6
How far can a great white shark smell blood? 🦈
- 100 metres
- 1 kilometre
- 5 kilometres
- 50 kilometres
Question 6 of 6
What is bioluminescence? 💡
- When deep-sea fish make their own light
- When coral changes colour
- The blue colour of ocean water
- A type of underwater plant
📚 Key Words
echolocation
Finding objects by sending out sounds and listening for echoes. Dolphins and bats both use echolocation.
marine
Relating to the sea. Marine animals are those that live in or near the ocean.
predator
An animal that hunts and eats other animals. Sharks and dolphins are marine predators.
bioluminescence
The ability of a living creature to produce its own light using chemical reactions.
coral reef
An underwater structure built by tiny coral polyps. Reefs support enormous biodiversity.
krill
Tiny shrimp-like creatures that form massive swarms. Blue whales eat tonnes of krill every day.
camouflage
Disguising appearance to blend in with surroundings. Octopuses are masters of camouflage.
species
A group of animals or plants that share the same characteristics and can breed together.
📚 More to Explore