Ecological Relationships Activity: 8 Hands-On Stations for Teaching Predator/Prey, Symbiosis, and Competition (TEKS 6.12B)

Chris Kesler · 8 min read

Drop a 6th grader into a forest and ask them to name a relationship between two organisms. They will say "a wolf eating a deer" every time. That is the only one they know. Then ask about the bird that builds its nest in a tree, or the worm in the dog's gut, or the bees on the flowers. Suddenly the conversation goes quiet. Most kids have no idea those count as ecological relationships too.

That is the doorway into TEKS 6.12B. The standard asks 6th grade students to describe ecological relationships including predator and prey, parasitism, mutualism, commensalism, and competition. Five different relationships, all happening simultaneously in every ecosystem. Most kids meet the full set for the first time in 6th grade.

The Ecological Relationships Station Lab for TEKS 6.12B closes that gap in one to two class periods. Kids play three rounds of a bead-collecting game where they BECOME species A, B, and C and live through competition, predation, and mutualism in real time. They read about lions and zebras, ants defending acacia trees, barnacles on whales, and poison ivy strangling oaks. They study three population graphs and sort nine real-world scenarios into three categories. By the end, they can name every type of ecological relationship and give a real example of each.

⏱ 1 to 2 class periods 📓 6th Grade Science 🧪 TEKS 6.12B 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching ecological relationships

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check, and break misconceptions while kids work through the rotation.

The Ecological Relationships Station Lab has four input stations (where students take in new info on the five types of ecological relationships) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn ecological relationships

🎬 Watch It! —

Students watch a YouTube video up to the 6:08 mark that walks through real ecological relationships in nature, including antlions hunting ants, acacia ants defending acacia trees, and commensal organisms living on hosts. Three task-card questions tie it back to what happens to the antlion population when ants increase, how mutualism benefits both partners on an acacia tree, and an example of commensalism from the video. Visual learners come alive at this station because they see the relationships happen on screen before they read about them.

📖 Read It! —

A one-page passage called "Relationships in an Ecosystem" walks students through the three main relationship categories with concrete examples: a lion eating a zebra (predatory), woodpeckers and squirrels competing for nest spots in trees (interspecies competition), ants defending acacia plants (mutualism), barnacles on a whale (commensalism), and poison ivy choking out an oak (parasitism). The vocabulary is bolded throughout (predatory, symbiosis, mutualism, commensalism, parasitism). Three multiple-choice questions plus the vocabulary section follow. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Three group members BECOME Species A, B, and C, with cups labeled with their letter and a spoon for collecting beads. Round 1: each species can only eat one specific color (yellow for A, green for B and C). Species B and C compete for the same color and the lab models interspecies competition in real time. Round 2: A becomes a predator that can only steal beads from B's and C's cups. Round 3: A and B share blue and green, but B has to remove red beads (toxic to its young) and put them in C's cup, modeling mutualism. After each round students record bead counts on a data table and answer questions about which ecological relationship they just lived through.

💻 Research It! —

Students examine 12 reference cards: three population graphs (Predator-Prey, Competitor Populations, Symbiotic Populations) plus a diagram showing how mutualism is +/+, commensalism is +/0, parasitism is +/-, and competition is -/-. Five short text cards then define each relationship clearly. Five questions check whether they can identify which line on the predator-prey graph is the prey, why predator populations decrease after prey crashes, what happens to the second competitor when one is hit by disease, and which type of relationship a butterfly drinking nectar represents.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A three-column card sort. Kids match nine scenario cards into Predatory, Competition, and Symbiotic columns. Wolves cooperating to kill a moose goes under predatory. A pitcher plant trapping insects goes under predatory (and surprises kids who forgot plants can be predators too). Two male mountain sheep ramming horns for mates goes under competition. A cuckoo bird laying its egg in another bird's nest goes under symbiotic (specifically parasitism). A hermit crab carrying a sea anemone goes under symbiotic (mutualism). Easy to spot-check at a glance.

🎨 Illustrate It! —

Students sketch a forest ecosystem with a variety of organisms. They have to show two members of the same species competing for something (intraspecies competition, like two squirrels going for the same acorn) and two members of different species competing for a resource (interspecies competition, like a woodpecker and a squirrel both wanting the same tree hole). Even kids who say "I can't draw" surprise themselves here. The arrows reveal whether they understand that competition exists both within a species and between species.

✍️ Write It! —

Three open-ended questions in complete sentences: explain the difference between predation and parasitism (a parasite usually doesn't kill its host quickly because it needs the host alive), agree or disagree with the claim that competition only happens when resources are limited and explain why, and create an analogy a younger student would understand for the three forms of symbiosis. This is the writing practice middle schoolers need and rarely get in science class.

📝 Assess It! —

Eight multiple-choice and fill-in-the-paragraph questions tied to TEKS 6.12B vocabulary (predatory, symbiosis, mutualism, commensalism, parasitism). Includes which relationship is one-sided neutral (commensalism), why overhunting harms a predator population (more predators competing for fewer prey), and what mutualism actually means. The fill-in paragraph weaves all five vocabulary words together. If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: design a poster pitching yourself as a commensal organism that needs a new host, create a symbiosis bookmark with a clear visual for parasitism, mutualism, and commensalism, write an acrostic poem on the word PREDATOR using examples of different predators, or research an example of symbiosis NOT covered in the lab and write five sentences or build a slideshow about it. Requires teacher approval before they start.

How this fits into a complete ecological relationships unit

This Station Lab is the Explore day of our full Ecological Relationships Complete 5E Lesson for TEKS 6.12B. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Ecological Relationships Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on ecological relationships, the Station Lab on its own does the job.

Two options

Ecological Relationships 5E Lesson cover

Full 5E Lesson $13.20 Get the 5E Lesson

Ecological Relationships Station Lab cover

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach ecological relationships

Materials beyond what's in the download:

A bowl of mixed beads in 5 colors per group for the Explore It! game (yellow, green, orange, red, blue). Aim for 30 to 50 of each color so groups don't run out mid-round.
3 cups labeled A, B, and C per group for the Explore It! activity.
3 plastic spoons per group for collecting beads from the bowl.
A 1-minute timer per group (or one for the whole class). A phone stopwatch works.
Colored pencils or markers for the Illustrate It! station.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station

Standard covered: Texas TEKS 6.12B —

Describe ecological relationships such as predator and prey, parasitism, mutualism, commensalism, and competition. Supporting Standard.

See the full standard breakdown →

Grade level: 6th grade life science

Time: One to two class periods (45 to 110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"Mutualism just means two animals being nice to each other."
Sixth graders romanticize mutualism. They picture two friends helping each other out. The real definition is colder: both organisms benefit because they need each other to survive or thrive. The Read It! ant and acacia example is perfect. The ants get a safe home inside hollow thorns. The acacia gets bodyguards that attack any animal trying to eat its leaves. Neither one is being nice. Both are getting paid in survival currency. The Research It! +/+ diagram makes the math explicit. The Write It! analogy question forces students to invent their own concrete example, which is how I know they actually got it.
"Parasites and predators are basically the same thing."
This one trips up almost every 6th grader. Both involve one organism harming another, so kids lump them together. The fix is in the timing. A predator kills its prey and eats it fast. A parasite keeps its host alive as long as possible because it needs the host to live in or on. The Read It! poison ivy and oak tree example helps. Poison ivy doesn't kill the oak immediately. It slowly steals sunlight until the oak weakens, sometimes for years. The Write It! station then asks students to explain the difference, and the ones who understand the timing nail it.
"Competition only happens between members of the same species."
Kids assume competition is something like two lions wrestling over a zebra. They miss the bigger picture. The Read It! passage names two kinds: intraspecies (same species, like two male mountain sheep ramming horns for mates) and interspecies (different species, like woodpeckers and squirrels both wanting the same tree hole). The Explore It! Round 1 game makes interspecies competition concrete. Species B and C both eat green beads. They have to compete for the same food source. Most rounds end with one of them not surviving. The Organize It! card sort then forces students to identify nine different real-world scenarios as competition, predation, or symbiosis.

What you get with this ecological relationships activity

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (Predator-Prey, Competitor, and Symbiotic Populations graphs plus the +/+ +/0 +/- relationship diagram and definitions)
Explore It! Species Task Cards for three rounds (9 cards total) plus the Explore It! data table
Sort cards for the Organize It! station (9 scenario cards split between Predatory, Competition, and Symbiotic columns)
Student answer sheets for each level

Tips for teaching ecological relationships in your 6th grade classroom

Two things make this lab go smoother the first time:

1. Pre-bag the bead sets and label by color counts.

The Explore It! game depends on having enough of each color. If a group runs out of green beads halfway through Round 1, the whole simulation falls apart. Bag each set in advance with at least 30 of each color (yellow, green, orange, red, blue). Label the bag with the count so the next teacher who borrows the set can confirm. Once the bags exist, you reuse them every year and they pay for themselves the first day.

2. Demo Round 1 of Explore It! with the whole class before rotations start.

The Explore It! game has a lot of moving pieces (three players, secret task cards, a 1-minute timer, no stealing, no cup guarding). The first group to hit the station will burn 5 minutes figuring out the rules. Demo Round 1 at the front of the room with three student volunteers during your warm-up. Two minutes of demo saves 10 minutes of confusion across all rotations. The remaining rounds get easier because the format is the same.

Get this ecological relationships activity

Ecological Relationships Station Lab for 6th grade life science TEKS 6.12B

Buy the Station Lab - $7.20

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson - $13.20

(Station Lab is included)

Frequently asked questions

What does TEKS 6.12B cover?

Texas TEKS 6.12B asks 6th grade students to describe ecological relationships such as predator and prey, parasitism, mutualism, commensalism, and competition. Students should be able to define each one, give a real-world example, and explain whether each organism in the relationship is helped, harmed, or unaffected.

Is this kids' first time meeting symbiosis?

Yes for most 6th graders. Predator and prey is usually familiar from earlier grades, but the formal vocabulary for symbiosis (mutualism, commensalism, parasitism) is brand new. The Read It! passage introduces all five vocabulary words in bold. The Research It! diagram shows the +/+ +/0 +/- pattern visually so kids have a memory hook beyond the words.

How long does this ecological relationships activity take?

One to two class periods (45 to 110 minutes total). The Explore It! three-round bead game is the longest piece because each round needs a 1-minute timer and a discussion afterward, so plan for two periods the first time you run a station lab. Once your class has the rotation routine down, most groups can finish all 8 stations in one period.

Do I need a lot of supplies for this?

Mostly just beads, cups, and spoons for the Explore It! game. About 30 to 50 beads in each of 5 colors per group, 3 cups per group, and 3 spoons per group. Total cost for a class of 30 set up in 8 station rotations: under $20 if you're starting from nothing. The Watch It! station also needs a device with internet.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. The Explore It! game has a digital simulation where students drag virtual beads into virtual cups across the three rounds. The Organize It! card sort and the Research It! population graphs work especially well digitally because they are clickable and draggable.