The Bear Budget Challenge
Turn delayed implantation into a classroom budgeting simulation.
- Kit needed
the ultimate biological budgeting system.
Turn delayed implantation into a classroom budgeting simulation.
Students must spend energy tokens on winter survival needs:
Maintaining the mother’s body
Staying warm in the den
Supporting pregnancy
Producing milk
Keeping cubs alive until spring
Then give each group a different fall feeding scenario:
| Scenario | Food Available | Starting Energy Tokens |
|---|---|---|
| Berry-rich fall | High | 100 |
| Average fall | Medium | 75 |
| Drought year | Low | 50 |
| Human food conflict year | Unstable | 60, with penalty cards |
| Salmon-rich year | Very high | 115 |
Add “surprise cards” to make the activity more realistic:
Early snowstorm: lose 10 tokens
Great berry patch: gain 15 tokens
Disturbed den: lose 20 tokens
Extra cub: milk cost increases
Warm den site: save 10 tokens
Poor food year: lose 15 tokens
The final student question is:
“Was this just about having cubs, or was it about having enough energy to survive and raise them?”
That is the science. Delayed implantation is not a pregnancy delay for convenience. It is a survival budget written into biology.
Questions to ask
- “Was this just about having cubs, or was it about having enough energy to survive and raise them?
Where it comes from
Imagine if pregnancy came with a built-in calculator.
Not a phone app. Not a spreadsheet. A real biological system that asks:
Read the blog post ↗ Masters of Delayed Implantation: The Weird Biology of Bear Pregnancy · 2026-05-20
Workspace
Run it with your class
Set up the class, count what needs counting, write down what happened, then save it and take it with you. Everything here stays in this browser until you download it.
The class
Counters
Results table
Notes as you go
This activity has no numbered steps, so use the notes box.
Answers to the questions
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