Under the Sea Early Years Activities: Ocean Habitats and an Interactive Ocean Game
A whole blue world of early wonder
The ocean is a perfect early-years classroom: vast, colourful, full of astonishing creatures and just the right amount of “what lives down there?” to spark questions for weeks. Children love rockpools, shells, whales and waves long before they can read the word sea, and under-the-sea topics link naturally to habitats, lifecycles, patterns, rhythm, movement and caring for our planet.
These five practitioner-designed activities cover the full EYFS framework. A tuff tray rockpool for Understanding the World, an ocean-in-a-bottle calm jar for science and Expressive Arts, a sea creature yoga story for Physical Development, shell sorting for Mathematics, and a mixed-media coral reef collage for art and fine motor control. Paired with the interactive Feed the Ocean Friends game, this pack is ready for a splashy topic week or a whole ocean term.
Our Top 5 Under the Sea Activities
Tap an icon to jump to each activity
🐠 Feed the Ocean Friends
Six sea friends are hungry. Each one wants something different. Drag a snack from the sandy tray and drop it on the friend with the matching thought bubble. Feed all six to win!
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Friends fed
👋 Drag a snack onto the sea friend who is thinking about it!
🧺 Snack tray
Krill
Kelp
Plankton
Shell bits
Mussel
Little fish
Keyboard play: tab to a snack, press Enter to pick it up, tab to a friend and press Enter to feed them.
Activity 1
Rockpool Explorers Tuff Tray
Best for: Understanding the World · Communication & Language · Physical Development · PSED
What you need
- A large shallow tuff tray, or two washing-up bowls linked by a strip of blue fabric
- Smooth pebbles, rocks and sea glass for rockpool walls
- A selection of real cleaned shells: cockle, mussel, whelk, limpet, scallop
- Plastic rockpool creatures: crab, starfish, seahorse, small fish, sea snail
- Strips of edible green seaweed or ribbons cut to look like kelp
- Child-size magnifying glasses, viewing pots, soft paintbrushes and wooden tweezers
- Clipboards with laminated rockpool spotter sheets and chunky pencils
How to set it up
- Build two “pools” in the tray with pebble walls, fill with a thin layer of water.
- Hide creatures under shells, in the kelp and between pebbles. Leave some easy to spot.
- Model slow, quiet hands first: “Rockpool creatures are shy, we watch gently.”
- Children work in pairs, one holds the pot, one uses the brush to gently collect a find.
- Finish with a “rockpool museum” huddle: share what was found, then return each creature.
💬 Adult prompts
- “What do you think is hiding under this shell?”
- “How does a crab move compared to a fish?”
- “Can you feel how smooth this pebble is? Why is it smooth and not sharp?”
- “Why do creatures like to hide in the rockpool?”
- “How can we look after a rockpool when we visit a real beach?”
📚 EYFS links
- Understanding the World: habitats, living things, tides and the natural world.
- Communication & Language: descriptive vocabulary (smooth, rough, slippery, spiny).
- Physical Development: pincer grip with tweezers, careful handling of small creatures.
- PSED: respect for living things, taking turns at the tray, sharing finds.
- Maths: tallying who found what, comparing sizes of shells and pebbles.
✨ Extensions & differentiation
- Ages 1 to 2: use larger shells and pebbles only, focus on scooping and pouring water.
- Ages 3 to 4: name each creature, sort shells into bowls by size or colour.
- Ages 4 to 5: create a picture map of the tray, marking where each creature was found.
- Challenge: introduce the idea of high tide and low tide, why do rockpools appear and disappear?
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Hygiene tip: use cooled boiled water or bottled water for the pools so splashes are safe for mouths. Boil or wash real shells thoroughly before use, and check for sharp edges. Supervise closely with under threes who may try to taste shells or pebbles.
Activity 2
Ocean in a Bottle Calm Jar
Best for: Understanding the World · Expressive Arts & Design · PSED · Early Science
What you need
- Clear plastic bottles with screw lids, one per child (300 to 500 ml)
- Jug of water and a jug of clear cooking oil or baby oil
- Blue food colouring, plus optional green for rock-pool variations
- Biodegradable glitter, sequins, tiny shells and plastic sea creatures
- Small funnels, teaspoons and a tray to catch drips
- Hot-glue gun (adult use only) to seal the lids securely
- Bunting tags or labels so each child can name their ocean
How to set it up
- Fill each bottle about one third with water, add 3 drops of blue food colouring, swirl.
- Top up with oil almost to the neck of the bottle, watch the two liquids sit apart.
- Drop in glitter, sequins, a small shell and a tiny sea creature, one at a time.
- Screw the lid on tightly, then seal with hot glue to make it leak-proof.
- Tilt, rock and gently shake the bottle to make a wave, then set it down to watch the sea settle.
💬 Adult prompts
- “Why do you think the water and the oil stay apart?”
- “Can you make a tiny wave, a big wave, then a calm sea?”
- “What is floating and what is sinking? Why?”
- “How does watching the bottle make your body feel?”
- “Which creature would love to live in your ocean?”
📚 EYFS links
- Understanding the World: early science, materials, predicting and observing.
- Expressive Arts & Design: aesthetic choices of colour, layering and sparkle.
- Physical Development: pouring, scooping and screw-lid fine motor control.
- PSED: calm-down tool for self-regulation, watching the ocean settle.
- Communication & Language: new vocabulary (float, sink, separate, layer).
✨ Extensions & differentiation
- Ages 1 to 2: practitioner makes the bottle, toddler shakes and watches, describes what happens.
- Ages 3 to 4: predict which items will float and which will sink, then test.
- Ages 4 to 5: make two bottles with different oil-to-water ratios, compare.
- Calm corner use: place finished bottles in a “quiet sea” corner with soft cushions.
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Safety note: always seal lids with hot glue yourself, and check the seal before handing the bottle back. Baby oil is often gentler than cooking oil for skin if a bottle ever leaks. Avoid glitter that contains loose sparkle dust for the youngest children.
Activity 3
Sea Creature Yoga and Movement Story
Best for: Physical Development · Communication & Language · PSED · Expressive Arts & Design
What you need
- A large cleared space, or an outdoor lawn on a dry day
- A big stretch of blue lycra or a blue sheet to be the ocean
- Sea creature picture cards: starfish, crab, jellyfish, shark, pufferfish, dolphin, octopus
- Soft ocean music or whale-song soundtrack on a speaker
- A story anchor: The Rainbow Fish or Tiddler by Julia Donaldson
- Small foam fish or pompoms to scatter on the lycra wave
How to set it up
- Gather everyone on the edge of the lycra, read the chosen story.
- Turn on the music softly. Hold up a card and model the movement.
- Work through poses together: starfish (wide arms and legs), crab (walk sideways), jellyfish (bounce gently), pufferfish (puff cheeks then whoosh), dolphin (swim arms), octopus (wave eight limbs), shark (glide with one arm fin on head).
- Everyone holds the lycra edges, whoosh it up and down to make waves, foam fish jump.
- End with a floating meditation: lie on backs, imagine drifting like a jellyfish.
💬 Adult prompts
- “How does a crab walk? Let’s try it together, sideways!”
- “A jellyfish has no bones. Can you be as wobbly as one?”
- “Which creature is the fastest? The slowest? Why?”
- “Take a big breath like a pufferfish, then let it whoosh out.”
- “Floating quietly, what do you hear under the water in your mind?”
📚 EYFS links
- Physical Development: gross motor balance, coordination, body control and breath control.
- Communication & Language: action verbs, adjectives, listening for instructions.
- PSED: self-regulation through breath and movement, working as an ocean together.
- Expressive Arts & Design: imaginative embodiment of different creatures.
- Understanding the World: how different creatures move in water, adaptation.
✨ Extensions & differentiation
- Ages 1 to 2: simple copy-me movements, no poses held, lots of wave shaking.
- Ages 3 to 4: children pick a card and lead the class in their creature’s movement.
- Ages 4 to 5: create an ocean dance sequence of five creatures in a row.
- Challenge: make up a new sea creature, then show the group how it would move.
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Calm to lively balance: start slow with the story, build energy with the waves, then settle back down with the floating meditation. This shape mirrors the EYFS wellbeing rhythm of connect, engage, regulate.
Activity 4
Shell Sort, Count and Pattern Maths
Best for: Mathematics · Fine Motor · Communication & Language · Understanding the World
What you need
- A mixed bag of real cleaned shells of different types, sizes and colours
- Small wooden bowls or sorting trays with four to six sections
- Numeral cards 0 to 10, ten-frames and dot cards
- Balance scales with small weights for comparing shells
- Wooden tweezers, tongs and teaspoons for fine motor challenges
- A laminated “seabed” mat for creating ABAB shell patterns
- A magnifying glass so children can look inside spiral shells
How to set it up
- Pile all the shells in the centre of the table for a brief “wow” moment.
- Invite children to sort shells into the bowls by size, then shape, then colour.
- Roll a dice, count that many shells into the matching numeral tray.
- Make an ABAB pattern along the mat: white, pink, white, pink. Ask children to continue.
- Balance two piles on the scales. Which is heavier? How many more shells are needed?
💬 Adult prompts
- “How many shells are in this bowl? Let’s count them one at a time.”
- “Can you spot two shells that are the same? What makes them a match?”
- “Which shell is the biggest? The smallest? Can you line them up in order?”
- “Can you carry on my pattern? What comes next?”
- “If I take one shell away, how many will be left?”
📚 EYFS links
- Mathematics (Number): counting, one-to-one correspondence, subitising up to five.
- Mathematics (Numerical Patterns): comparing more and fewer, adding and subtracting one.
- Mathematics (Shape, Space & Measure): sorting, repeating patterns, weight.
- Physical Development: pincer grip with tweezers, careful carrying of small objects.
- Understanding the World: shells are the homes of living creatures.
✨ Extensions & differentiation
- Ages 1 to 2: post shells through a shape sorter, pure heuristic play.
- Ages 3 to 4: match each numeral card to the correct quantity of shells.
- Ages 4 to 5: simple addition, “I have 4 shells, you have 2. How many together?”
- Challenge: make an ABC pattern (white, pink, swirl, repeat) and photograph it.
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Hygiene tip: always wash shells in warm soapy water and air-dry fully before use. Check for sharp edges, especially on broken cockle and limpet shells. Supervise under threes closely as small shells are a choking risk.
Activity 5
Coral Reef Mixed-Media Collage
Best for: Expressive Arts & Design · Physical Development · Understanding the World · Fine Motor
What you need
- A big piece of deep blue card or paper as the ocean background, per small group
- Tissue paper in coral pinks, oranges, yellows, greens and purples
- Dried pasta shapes: shells (conchiglie), spirals (fusilli), bows (farfalle)
- Bubble wrap squares cut to the size of a hand, plus cupcake cases
- PVA glue in tubs with spreaders, child-safe scissors, googly eyes, sequins
- Drinking straws, scraps of raffia or wool for seaweed strands
- Sand or dried couscous for a sprinkle-on ocean floor
How to set it up
- Lay the blue card flat and brush a sandy strip of glue along the bottom, sprinkle sand to make the seabed.
- Build up the reef in layers: cupcake-case coral bases, tissue-paper coral fronds, pasta shells.
- Add a waving kelp forest with wool and raffia strands glued vertically.
- Children create their own fish with tissue paper and googly eyes, glue them darting around the reef.
- Finish with bubbles: press bubble wrap in white paint and print rising bubble trails.
💬 Adult prompts
- “What colours do you see on a real coral reef?”
- “Can you layer your coral, big at the back, small at the front?”
- “Your fish looks fast! Where is it swimming to?”
- “How does bubble wrap feel under your fingers? Squishy?”
- “Coral is alive! It is a tiny animal, not a plant. Isn’t that amazing?”
📚 EYFS links
- Expressive Arts & Design: layering, collage, colour mixing, texture as expression.
- Physical Development: snipping, tearing, pressing, pincer grip, spreading glue.
- Understanding the World: coral reefs as living habitats, lifecycles of creatures.
- Communication & Language: vocabulary for colours, textures, creatures and habitats.
- PSED: working on a shared piece, contributing to a bigger picture.
✨ Extensions & differentiation
- Ages 1 to 2: huge sticky tape loops on the blue card for children to press tissue and pasta onto, no glue pots.
- Ages 3 to 4: cut simple fish shapes ready, children decorate and place them.
- Ages 4 to 5: draw their own fish, label the creatures, add a title for the reef.
- Challenge: research one real reef creature, add a “fact flap” to the collage.
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Real-world link: finish by sharing a short video clip of a real coral reef and a gentle chat about how reefs need clean oceans. This roots the artwork in respect for the planet, a lovely way to introduce early eco-awareness.
Frequently Asked Questions
Quick answers for running under-the-sea activities in early years
What age are these under-the-sea activities suitable for?
All five activities cover the full EYFS range from 1 to 5. The ocean bottle and rockpool tray are lovely even for babies when closely supervised. Three-year-olds love the sea creature yoga and the Feed the Ocean Friends game. Four and five-year-olds can lead the shell maths, design the coral reef collage and remember the characteristics of each sea creature.
How do these activities link to the EYFS framework?
Together they cover all seven EYFS areas. Communication and Language through story and descriptive vocabulary, Personal, Social and Emotional Development through calm-jar regulation and shared reef building, Physical Development through yoga and fine motor shell work, Literacy through spotter sheets and labels, Mathematics through shell sorting and counting, Understanding the World through habitats and simple marine science, and Expressive Arts and Design through the reef collage and tissue paper work.
I am nowhere near the sea. Can we still do these activities?
Absolutely. None of the activities need a real beach. A tuff tray rockpool, plastic creatures and a collection of shells from a craft shop is enough. Many children have never visited the coast, and that is all the more reason to bring the ocean to your setting. Finish the topic week with a short ocean video so everyone shares a sense of the real sea.
How do I introduce the ocean to children who are scared of water or big creatures?
Start dry. The collage, the shell sorting and the picture-card yoga can all be done without any water. Let nervous children meet plastic and paper sea creatures first, then move to the calm jar where the sea is safely behind plastic. Keep language gentle and curious, never teasing. Celebrate every kind of participation.
Are any of the materials taste-safe for babies?
Shells are not taste-safe and must be closely supervised. For the sensory tray with a baby present, swap real shells for big wooden or silicone sea creature toys. For the ocean bottle, seal the lid thoroughly with hot glue. Any edible seaweed should be straight from its packet and within date. Always check allergens before offering food-based materials.
How do I talk about plastic pollution gently in early years?
Keep it positive and action-focused. Point out that turtles sometimes think plastic bags are jellyfish, and show how recycling at snack time keeps the sea clean. Avoid frightening images. Finish with a do-good moment: a picking-up-litter walk in the garden or a craft from recycled packaging. Children leave feeling powerful, not worried.
How can I involve families in the ocean topic?
Send home a shell-collecting bag if parents are heading to a coast, and a list of sea creature story books for bedtime reading. Ask families to donate clean clear bottles for ocean calm jars. Share finished coral-reef collages via your parent-communication app, and invite families to add a “fact of the sea” each week from home. A beach photograph wall is a lovely display that celebrates every family.