Halloween Population Ecology Worksheet – Carrying Capacity, Limiting Factors, Lab

What happens when ONE vampire moves into a town of 25,000 humans? 🧛

At first, the math makes a vampire takeover look inevitable. But then limiting factors, carrying capacity, competition, disease, and resource availability get in the way!

In The Vampire Population Problem, students investigate population ecology through a Halloween-themed simulation that takes them from simple exponential growth to a much more realistic model of interacting populations.

How It Works

Students begin with one vampire and model what happens when the population doubles every three nights under ideal conditions. They calculate population growth, create an exponential growth graph, and consider an important question: Can a population really keep growing like this forever?

Then, the model changes!

Students track vampire AND human populations through a six-round simulation. One at a time, Event Cards introduce new conditions that change the populations and challenge students to rethink their original predictions.

As the simulation unfolds, students discover what happens when a growing population encounters the limits of its environment.

Students Explore:

• Exponential population growth
• Limiting factors
• Density-dependent vs. density-independent factors
• Carrying capacity
• Population overshoot
• Resource availability
• Competition
• Predator-prey relationships
• Population sustainability
• Scientific modeling

What’s Included:

• Complete student investigation
• Exponential growth calculations + graphing
• Limiting factor prediction
• Six-round vampire + human population simulation
• Population Tracker
• 6 Limiting Factor Event Cards
• Carrying capacity + overshoot analysis
• Resource availability analysis
• Predator-prey connection
• Final Challenge
• Exit Ticket
• Complete Answer Key
• Comprehensive Teacher Guide
• Suggested pacing
• Differentiation + extensions
• Common misconceptions
• Classroom tips
• NGSS alignment

What’s Included:

• Streamlined Student Packet + Key: 10 student pages with predictions, population calculations, graphing, a Population Tracker, analysis questions, and a final claim-evidence-reasoning response. The key follows the student pages.
• Guided Teaching Presentation: Step-by-step lesson slides with the opening scenario, directions, six simulation events, discussion prompts, and matching student packet page and question references. Slides include presenter notes with teaching tips and calculation checkpoints.
• Original Full-Length Investigation + Key: Background information, directions, questions, and response spaces together in one student packet, including the original Exit Ticket.
• 6 Limiting Factor Event Cards: Included in the original resource and incorporated into the presentation for easy projection.
• Detailed Teacher Guide: Suggested pacing, implementation guidance, differentiation, extensions, common misconceptions, classroom tips, and NGSS alignment.

Planning & Printing

Allow approximately 60–90 minutes, depending on student needs and discussion time. Use one extended class period or divide the investigation across two class periods.

For the lower-paper option, print only student pages 1–10 of the streamlined packet and project the presentation. Students will need a pencil and calculator. No need to print both versions or a set of event cards for every student!

Perfect For: Biology • Environmental Science • Ecology • Population Ecology • Halloween Science • October Lessons • Population Growth • Carrying Capacity • Limiting Factors

This is a fun way to bring a little spooky season into your science classroom without sacrificing the science! Students get the Halloween hook while practicing the population ecology concepts they actually need to understand.

What busy teachers like you have said:
Cathy H. says, “In our study of population ecology in my AP class, I wanted to add some fun and this was the perfect resource! We had lots of fun completing this.”
Teresa C. says, “My students have loved this resource! Very engaging.”

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If you have any questions, please do not hesitate to ask.
Thanks for visiting!
Jessica