Food Web Maker
Make food webs for twelve ecosystems, from ocean, coral reef and rainforest to desert, tundra and pond, with producers, consumers by trophic level and decomposers, labeled or blank. Written for science classes and ecology.
Food web examples
Four food webs: a labeled temperate forest, a five-organism worksheet, the Antarctic Ocean and a blank pond to fill in. Each is a real render of the prompt shown; click one to load that prompt and edit it.
How to make a food web: thirteen forest species in four rows
The labeled food web here is a temperate forest: three producers, ten consumers and two decomposers. It is built in four moves that work for any ecosystem.
- 1
Producers along the bottom
Oak tree, grass and berry bush make their own food, so every path in the web starts with one of them.
- 2
One row for each trophic level
Caterpillar, grasshopper, rabbit and mouse eat plants; songbird, frog, snake and fox eat them; hawk and owl top it.
- 3
Every arrow points to the eater
Grass → rabbit → snake → owl: each arrow carries energy from the food to the animal that eats it.
- 4
Decomposers in a box to the side
Dead remains from every row run into the fungi and bacteria, which get no row of their own.
Food web examples by ecosystem, from the open ocean to the desert
Name the ecosystem and the web is drawn with organisms that really live there. These are the ones asked for most, each with a typical cast from the producers to the top predators; swap in the species your course uses.
Ocean food web (marine food web)
Producers: phytoplankton such as diatoms and dinoflagellates. Primary consumers: zooplankton — copepods and krill. Secondary: anchovies, herring and sardines, which filter the zooplankton. Higher levels: tuna, squid, seabirds and seals eat the small fish; sharks and orcas sit on top, and orcas also take seals. Decomposers: marine bacteria, fed by the dead matter that sinks as marine snow. The Antarctic web in the examples above is the short version: phytoplankton → krill → penguins, seals and baleen whales → leopard seal → orca.
Coral reef food web
Producers: the algae living inside the coral (zooxanthellae), which feed it sugar, plus seaweed, turf algae and phytoplankton. Primary consumers: parrotfish and surgeonfish grazing algae, sea urchins, zooplankton; the coral polyps themselves also catch zooplankton. Secondary: butterflyfish and the crown-of-thorns starfish, which eat coral polyps, and small reef fish. Top predators: groupers, barracuda, moray eels and reef sharks. Decomposers and detritivores: bacteria and sea cucumbers.
Rainforest food web
Producers: canopy trees, fig trees, lianas and bromeliads. Primary consumers: leaf-eating insects, three-toed sloths, howler monkeys, fruit bats, macaws, capybaras and tapirs. Secondary: tree frogs and lizards eating insects, boa constrictors, ocelots, and toucans, which eat fruit and also eggs and small animals. Top predators: the harpy eagle, which takes sloths and monkeys, and the jaguar, which takes capybaras, peccaries and caimans. Decomposers: fungi, bacteria and termites, working so fast that most nutrients sit in the plants, not the thin soil.
Desert food web
A Sonoran Desert web. Producers: saguaro and prickly pear cactus, creosote bush, mesquite and desert grasses. Primary consumers: kangaroo rats and harvester ants eating seeds, jackrabbits, desert tortoises, grasshoppers. Secondary: scorpions and lizards eating insects, rattlesnakes eating kangaroo rats, the roadrunner eating lizards, snakes and insects. Top predators: coyotes, red-tailed hawks and great horned owls. Decomposers: bacteria and fungi, with darkling beetles and termites breaking down dead plants.
Tundra food web
The arctic tundra on land, where no trees grow. Producers: lichens, mosses, sedges, cotton grass and dwarf willow. Primary consumers: lemmings, arctic hares, caribou feeding on lichen, musk oxen, ptarmigan and summer insects. Secondary: arctic foxes, snowy owls and ermine, all of which depend heavily on lemmings, and the gyrfalcon, which hunts ptarmigan. Top predator: the arctic wolf, hunting caribou and musk oxen. Decomposers: bacteria and fungi, slowed by the cold so that dead matter builds up as peat.
Arctic food web
The Arctic Ocean and its sea ice, as opposed to the tundra on land. Producers: ice algae growing under the sea ice, and phytoplankton. Primary consumers: copepods and amphipods. Secondary: arctic cod, the fish that links the plankton to almost everything above it. Higher levels: ringed seals, beluga whales, narwhals and seabirds such as thick-billed murres eat the cod. Top predators: the polar bear, which hunts ringed and bearded seals from the ice, and the orca.
Forest food web
A temperate deciduous forest, the subject of the labeled web above. A fuller version: producers oak and maple trees, shrubs and ferns; primary consumers white-tailed deer, gray squirrels and chipmunks eating acorns, mice, caterpillars; secondary red foxes, rat snakes, songbirds eating caterpillars, and raccoons and black bears as omnivores; top predators owls, hawks, bobcats and, in large forests, wolves. Fungi break down the leaf litter, with earthworms and millipedes as detritivores.
Taiga food web
The boreal forest of spruce, fir and pine. Producers: conifers, birch, aspen, willow, mosses and lichens. Primary consumers: snowshoe hares, moose browsing willow and aspen, red squirrels eating spruce cones, voles and spruce budworm caterpillars. Secondary: pine martens, great grey owls and boreal owls hunting voles and squirrels. Top predators: the Canada lynx, which lives mainly on snowshoe hares — their numbers rise and fall together roughly every ten years — and wolves hunting moose.
Grassland food web
A North American prairie. Producers: big bluestem, switchgrass, buffalo grass and wildflowers. Primary consumers: bison, pronghorn, prairie dogs and grasshoppers. Secondary: black-footed ferrets, which live almost entirely on prairie dogs, meadowlarks eating insects, prairie rattlesnakes and badgers. Top predators: coyotes, ferruginous hawks and golden eagles. Decomposers: bacteria and fungi, with dung beetles burying bison dung.
Savanna food web
The African savanna, grass with scattered trees. Producers: grasses and acacia trees. Primary consumers: zebras and wildebeest grazing, giraffes browsing acacia leaves, gazelles, elephants and termites. Predators: lions taking zebras, wildebeest and buffalo; cheetahs taking gazelles; leopards, spotted hyenas and African wild dogs, so one prey species usually has several arrows leaving it. Scavengers and decomposers: vultures and hyenas on carcasses, dung beetles, termites, bacteria and fungi.
Pond and freshwater food web
Pond: algae, duckweed and pondweed are eaten by water fleas, snails, tadpoles and mayfly nymphs; dragonfly nymphs, minnows and frogs eat those; perch and bass eat the small fish and nymphs; a great blue heron or a snapping turtle sits on top. Lake or river: phytoplankton → zooplankton → minnows and sunfish → bass, pike or trout → osprey, river otter or bald eagle. Bacteria and fungi break down the dead matter on the bottom.
Everglades and wetland food web
Producers: sawgrass, and periphyton, the mats of algae that coat the shallow water. Primary consumers: apple snails, grass shrimp, crayfish and insect larvae. Secondary: mosquitofish and other small fish; the snail kite, which eats almost nothing but apple snails; wading birds such as great egrets, white ibis and wood storks, eating crayfish and small fish; largemouth bass and Florida gar. Top predators: the American alligator, and the Florida panther on dry ground. Add the invasive Burmese python if the lesson is about what it has done to the mammals.
Simple food web
Five to eight organisms for a first lesson: grass, a rabbit, a mouse, a fox and a hawk, joined by five arrows. Give at least one animal two foods, or one food two eaters, so it reads as a web and not a chain. Ask for no trophic level names and no decomposers and only the organisms are labeled; the second example render above is this one.
Food web with decomposers
Decomposers — bacteria and fungi — break dead matter down chemically; detritivores — earthworms, millipedes, woodlice, dung beetles — eat it first. Draw them in a box to one side or along the bottom with an arrow coming in from every level, labeled “dead remains” or “waste”. If the lesson covers nutrient cycling, a dashed arrow from the decomposers back to the producers shows the nutrients returning, kept apart from the solid energy arrows.
Food chain, trophic levels and energy pyramid diagrams
A food chain diagram is one row: grass → grasshopper → frog → snake → hawk, with producer, primary, secondary, tertiary and quaternary consumer written underneath. A trophic levels diagram stacks the same levels as rows. An energy pyramid gives each level a bar about one tenth the width of the one below — 10,000, 1,000, 100, 10 kcal. Pyramids of numbers and biomass can be upside down, one oak feeding thousands of caterpillars; a pyramid of energy never is.
Trophic levels in a food web
The roles a labeled food web is normally expected to show, what each one eats, examples from a temperate forest, and where each goes on the diagram. This is the default layout unless you ask for something else.
| Role | What it eats | Forest examples | Where to draw it |
|---|---|---|---|
| Producers (1st trophic level) | Nothing — makes its own food from sunlight, carbon dioxide and water by photosynthesis | Oak tree, grass, berry bush | Along the bottom row |
| Primary consumers (2nd level) | Producers — they are herbivores | Caterpillar, grasshopper, rabbit, mouse | In the row above the producers |
| Secondary consumers (3rd level) | Primary consumers | Songbird, frog, fox | In the row above the herbivores |
| Tertiary consumers (4th level) | Secondary consumers | Hawk eating snakes and songbirds | Near the top |
| Apex predators | Other consumers; nothing preys on them as adults | Hawk, great horned owl, wolf | At the very top |
| Omnivores | Both producers and consumers | Black bear, raccoon | Between rows, with arrows coming in from plants and from animals |
| Decomposers | Dead organisms and wastes from every level | Fungi, bacteria | To one side, with arrows coming in from every level |
| Detritivores | Dead plant and animal matter, eaten whole | Earthworms, millipedes, woodlice | Beside the decomposers |
Arrows always point toward the eater. Most worksheets also ask for the trophic level names down the side and for decomposers linked to every level. Name the organisms you need and only those are drawn.
Food chain vs food web: what is the difference?
A food chain is a single path of energy from a producer to a top consumer, such as grass → rabbit → fox; a food web joins every food chain in an ecosystem into one network, so each organism can have several foods and several predators. The web is the more realistic model; the chain is easier to read and to test on.
| Food chain | Food web | |
|---|---|---|
| Shape | One straight line | A network of crossing links |
| Paths for energy | One | Many, overlapping |
| Organisms per trophic level | Usually one | Several |
| Foods per animal | One | Often several; omnivores feed on more than one level |
| What it shows well | The order of trophic levels and the energy lost at each step | Competition, omnivory and how losing one species affects the others |
| If one species disappears | The chain simply breaks | Other links can make up for it, or the loss cascades through the web |
| Typical use | First introductions in primary school | Middle school onward, ecology courses and research |
Draw a food chain as one row of arrows and a food web as rows by trophic level, with the same arrow rule in both: from the organism eaten to the organism that eats it.
Blank food web template: label the food web, then check four things
The same temperate forest with an empty line under every organism and both decomposers, and the trophic level names kept down the side as a guide. When students label the food web, these are the four places answers go wrong.
- 1
Arrow direction
Each arrow points to the eater: caterpillar → songbird, never songbird → caterpillar.
- 2
Level comes from the food
The hawk eats a songbird and a snake, both secondary consumers, so the hawk is tertiary.
- 3
Producer is not a consumer
The oak is the producer; the caterpillar eating it is the primary consumer.
- 4
Decomposers take every level
Fungi and bacteria go in the side box, fed by dead remains from producers and consumers alike.
What is a food web?
A food web diagram shows the feeding relationships in one ecosystem: producers such as plants and algae at the base, the consumers that eat them stacked above by trophic level, and decomposers that break down the remains, all joined by arrows that point from the organism eaten to the organism that eats it — the direction energy flows. Where a food chain follows one path, a food web shows all of them at once.
Key facts
- Arrows follow the energy, not the hunt. Each arrow points from the organism that is eaten to the organism that eats it: grass → rabbit → fox. An arrow from the fox to the rabbit reverses the flow of energy, and it is the most common mistake on a food web worksheet.
- Every web rests on producers. Plants, algae and phytoplankton make their own food, mostly by photosynthesis, and form the first trophic level; herbivores are the primary consumers, and the carnivores that eat them are secondary and tertiary consumers.
- Energy shrinks at every step. In Howard T. Odum’s classic study of Silver Springs, Florida, producers made 20,819 kcal/m²/yr, primary consumers 3,368, secondary consumers 383 and tertiary consumers just 21 — which is why food chains rarely run past four or five levels.
- One animal can feed on several levels. Omnivores such as bears eat both berries and salmon, and a snake that eats mice and frogs is a secondary and a tertiary consumer at once.
- Decomposers recycle matter, not energy. Fungi and bacteria break down dead organisms and wastes from every level and return nutrients to the soil or water for producers to reuse; the energy itself leaves the web as heat.
Common questions about food webs
How do I create a food web?
List the organisms in one ecosystem, sort them by what they eat — producers, primary, secondary and tertiary consumers, decomposers — and draw an arrow from each food to every animal that eats it. With this maker you describe the habitat or paste your list, and the web is drawn in rows by trophic level with every arrow pointing the right way.
Which way do the arrows go in a food web?
From the organism that is eaten to the organism that eats it — the direction energy flows. Grass → rabbit means the rabbit eats the grass. Arrows drawn from predator to prey are the error teachers see most often.
Can I get a blank food web for students to fill in?
Yes — view the blank version on this page free, or ask for one and every organism and trophic level name is replaced by an empty answer line. The labeled version is the matching answer key, so the two print as a pair.
Is there a free food web template?
Yes. The labeled and blank temperate forest food webs on this page are free to view, and you can generate a new template for any ecosystem. Ask for a pond, desert, ocean or grassland web and name the organisms your class studies.
What is the difference between a food chain and a food web?
A food chain follows one path of energy, such as grass → rabbit → fox; a food web joins all the food chains of an ecosystem, so one animal can eat several foods and be eaten by several predators. The comparison table above sets them side by side.
What are the trophic levels in a food web?
Producers form the first trophic level, herbivores (primary consumers) the second, carnivores that eat herbivores (secondary consumers) the third, and carnivores that eat other carnivores (tertiary consumers) the fourth, with apex predators at the top. Decomposers feed on dead matter from every level.
Where do decomposers go on a food web?
Usually to one side or along the bottom, with arrows running into them from every trophic level, since the remains of every level end up there. Some worksheets leave them out; ask for a web without decomposers and none are drawn.
Why do food webs rarely have more than four or five levels?
Because most of the energy at each level is used for living and lost as heat, so only a small fraction — often around 10% — passes to the next level. In Odum’s Silver Springs study, the tertiary consumers got about 0.1% of the energy the producers made.
What happens to a food web if one species is removed?
The effect spreads along its links. When sea otters decline, the sea urchins they eat multiply and strip the kelp forest bare — a trophic cascade. Ask for two webs side by side to show a food web before and after the loss.
Can I make a food chain instead?
Yes — ask for a food chain and the maker draws one row of organisms joined by arrows, from a producer to a top consumer, with the trophic level named under each.
What is an example of a food web?
In a temperate forest, grass is eaten by grasshoppers and rabbits, grasshoppers by songbirds, frogs and snakes, rabbits by snakes and foxes, and snakes by hawks and owls, while fungi and bacteria break down whatever dies. That is the labeled food web on this page. The list above gives a cast for the ocean, rainforest, desert, tundra and other ecosystems, and any of them can be drawn here.
Sources
- Ecology of Ecosystems — Biology 2e, section 46.1 — OpenStax
- Energy Flow through Ecosystems — Biology 2e, section 46.2 — OpenStax
- Food Web — National Geographic Education
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