Materials Needed

• Printed topographical or satellite maps of a fragmented region (provided in lesson links or printed from Google Earth; e.g., Southern California highways, Banff National Park area, or Florida Everglades)
• Tracing paper or clear plastic sheet overlays
• Colored markers, highlighters, and fine-tip pens
• Internet access for species research (Google Earth, IUCN Red List website, Conservation Northwest)
• Corridor Design Blueprint Worksheet (or notebook)
• Graph paper or 3D design software (optional for extension)

Lesson Overview & Objectives

Human development creates "habitat islands"—pockets of wild space surrounded by highways, suburbs, and farmland. For large or wide-ranging mammals, these barriers are often deadly, leading to roadkill, extreme inbreeding, and eventual local extinction. In this lesson, Heidi will step into the role of a Conservation Biologist and Landscape Architect to design a functional, science-backed Wildlife Corridor for a threatened mammal species.

Learning Objectives

• Explain the ecological impacts of habitat fragmentation on large mammal populations (genetic isolation, territorial needs, carrying capacity).
• Analyze real-world geographical and biological data to identify movement bottlenecks for a target species.
• Design a functional wildlife corridor blueprint integrating physical infrastructure (overpasses, underpasses, fencing) and behavioral ecology.
• Pitch a conservation strategy evaluating tradeoffs between human infrastructure and animal welfare.

Success Criteria

1. Introduction: The Hook & Scenario (15 Minutes)

Discussion & Educator Talking Points (Interactive)

• Ask Heidi: "If you were trapped in a single city block your whole life, what resources would run out first? How would that affect your health or your family's future?"
• Key Concept - Habitat Fragmentation: When wild land is broken into pieces, animal populations are split into smaller groups. This leads to a genetic bottleneck—without new animals coming in to breed, inbreeding increases, making populations vulnerable to disease and climate shifts.
• Key Concept - Island Biogeography: Small, isolated reserves hold fewer species and have higher extinction rates than large, connected habitats.

2. Direct Instruction: "I Do" - Corridor Mechanics (15 Minutes)

The educator presents key technical factors in designing successful mammal crossings.

What Makes a Wildlife Corridor Work?

1. Target Species Needs:
   • Ungulates (Elk, Deer): Prefer wide open overpasses with clear sightlines and natural grass/soil beneath their hooves. They hate tight, dark tunnels.
   • Large Carnivores (Cougars, Bears, Wolves): Need dense vegetative cover leading up to the crossing. Some prefer dark underpasses; others prefer quiet overpasses away from light/noise pollution.
   • Small/Arboreal Mammals (Marten, Flying Squirrels, Opossums): Need continuous canopy bridges or small culverts with woody debris for cover from predators.
2. Funneling Infrastructure: Animals don't automatically know a bridge is for them. High-tensile, wildlife-proof fencing (8–10 feet high) along roadsides is required to guide animals toward the crossing structure.
3. Human Management: Sound attenuation walls, dark-sky lighting fixtures nearby, and strict bans on human foot traffic/motor vehicles on the corridor.

3. Guided Practice: "We Do" - Analyzing the Banff Model (15 Minutes)

Work together with Heidi to analyze one of the world's most successful mammal corridor networks: Banff National Park, Alberta, Canada.

4. Independent Application: "You Do" - The Corridor Blueprint Challenge (40 Minutes)

Scenario: A regional planning committee has granted Heidi $5 Million in theoretical conservation funds to design a corridor connecting two fragmented wilderness zones divided by a major highway, suburban sprawl, and agricultural farmland.

Step 1: Choose a Focus Mammal

Heidi selects one target species to design for:

• Option A: Florida Panther (Focus: Avoid roadkill, cross highways/swamps, highly territorial, shy).
• Option B: Grizzly Bear / Lynx (Focus: Mountain pass connectivity, large home range, cold climate).
• Option C: Asian Elephant / Tiger (Focus: Human-wildlife conflict near agriculture, massive migratory path).
• Option D: Local Focus Species (Choose a native threatened mammal in your region).

Step 2: Map & Layer Design

1. Take a map of a fragmented landscape (or draw a realistic landscape featuring: Wild Zone A, Wild Zone B, 4-lane Highway, River, Farm Fields, Suburb).
2. Place a sheet of tracing paper/overlay over the map.
3. Draw the Corridor Route using color codes:
   • Green Zone: Core safe habitats & native food/water stations.
   • Yellow Lines: Directional wildlife fencing along high-risk zones.
   • Red Markers: Specific crossing points (Overpass vs. Underpass locations).
   • Purple Hatching: Buffer zones (e.g., tree lines shielding farm noise).

Step 3: Detail the Crossing Architecture

On graph paper or a separate sheet, sketch a detailed cross-section of one crossing structure (Overpass or Underpass). Include:

• Dimensions (width, height).
• Types of native vegetation planted on/in the bridge (e.g., berry bushes, tall trees, native grasses).
• Sound/light reduction barriers along the edges.
• Substrate/flooring material (soil, leaves, rock outcroppings).

Step 4: The 2-Minute Policy Pitch

Write a brief 1-page "Elevator Pitch" or record a 2-minute video pitch directed to local city planners explaining:

• Why this mammal needs this corridor.
• How it benefits humans too (e.g., reducing costly vehicular collisions, ecotourism).
• Why your design matches the specific behavior of the animal.

5. Conclusion & Reflection (10 Minutes)

Present & Debrief

Heidi presents her Corridor Blueprint and Pitch to the educator.

Reflection Questions

1. "What was the hardest tradeoff you had to make between human land use (farms/highways) and animal needs?"
2. "If climate change causes your target mammal's main food source to shift 50 miles north, how does your corridor help or hinder them?"
3. "How could local communities (landowners, suburban homeowners) contribute to this corridor without selling their property?" (e.g., wildlife-friendly fencing, planting native trees, keeping dogs inside at night).

Assessment Rubric

Differentiation & Extension Options