Engage your students with this NO PREP, interactive ecology cipher activity focused on invasive species, native species, food web disruption, competition, predators, prey, habitat loss, biodiversity, resource decrease, and ecosystem imbalance.

In this structured challenge, students solve clues by identifying the correct invasive species, food web, or ecosystem term. They then use the provided Invasive Species and Food Webs Cipher Key to find the matching number and convert that number into a letter using the number-to-letter chart. After answering all 20 questions, students “crack the code” and reveal a hidden message.

Please have a look at the preview to see how it works.

My Promise to You

I know every classroom is different. If you purchase a resource and feel it is not the right fit for your students, contact me and I’ll provide 2x the amount you paid in store credit toward another resource in my store, so you can find something that better supports your students.

✅ NO PREP – Just print and go!
✅ Great for ecology review, sub plans, early finishers, stations, or homework
✅ Reinforces invasive species, food webs, biodiversity, and ecosystem balance
✅ Includes a full answer key for quick and easy grading

What Students Will Learn

• Invasive species and native species
• Food webs and feeding relationships
• Predators and prey
• Competition between organisms
• Habitat loss
• Resource decrease
• Population decrease and overpopulation
• Biodiversity and biodiversity loss
• Food web disruption
• Ecosystem imbalance

This activity combines ecology content, logic, and problem-solving into one engaging experience that students actually enjoy. Rather than simply memorizing vocabulary, students actively apply their knowledge of species interactions, predator-prey relationships, symbiosis, competition, and cooperation to solve problems. This activity reinforces key ecology vocabulary, supports pattern recognition, and keeps students engaged through puzzle-based learning.

What’s Included

• 20 invasive species and food web cipher questions
• Invasive Species and Food Webs Cipher Key
• Number-to-letter chart
• Hidden message activity
• Full answer key with correct terms, cipher numbers, and decoded letters

Why Teachers Love This Resource

• Zero prep – just print and go
• High engagement through puzzle-based learning
• Reinforces calculation skills
• Encourages critical thinking and independence
• Great for review, stations, early finishers, or sub plans

Time Required

• 30–45 minutes
• Can be extended with small group discussions or a whole-class review

No prep, no formatting, no issues. Simply download, print (or upload), and you're all set.

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If you have any questions please feel free to send me an email - devon@teachwithfergy.com