Scaly Survivors Slides SCALY SURVIVORS
Unlocking the Secrets of Reptile Adaptations
Biology • Evolution • Survival
Rain of Reptiles?
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Florida's "Falling Iguana" Warning
What's happening?
When temperatures drop below 40°F, iguanas freeze in place and tumble from trees.
Are they dead or just "chilling"?
The Big Word: Ectothermic
Ecto-
"Outside"
Animals that rely on external heat sources to regulate body temperature.
Endo-
"Inside"
Animals that generate their own internal body heat (like us!).
Why is this an ADVANTAGE for a reptile?
Video: Trait Tracker
Get your worksheets ready!
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Watch For:
• Keratin-rich skin
• Reproduction (Ovi vs Vivi)
• Rib-cage breathing
• Jacobson's Organ
Class Reptilia: The 4 Orders
Chelonia
Turtles & Tortoises
Distinct shells; temperature-dependent sex determination.
Squamata
Lizards & Snakes
Largest order (95%); tail autonomy and Jacobson's organ.
Crocodilia
Gators & Crocs
Voracious predators; unchanged for 200 million years.
Rhynchocephalia
Tuatara
Living fossils from NZ; active in cold temperatures.
Design a Reptile
Your mission: Create a brand new reptile species that can survive in one of these EXTREME environments:
Arctic Tundra
Volcanic Peaks
Abyssal Ocean Cave
Atmospheric Void
Must include labels for: Skin, Respiration, and Sensory Organs!
Gallery Walk
Walk around the room and inspect your classmates' creatures. Can you guess their extreme environment just by looking at their 3 adaptations?
LOOK
at labels
ANALYZE
the function
GUESS
the environment
Scaly Survivors Worksheet SCALY SURVIVORS
Reptile Adaptation Field Log
NAME:
DATE:
Part 1: The Falling Iguana Mystery
Watch the "Falling Iguana" clip. In southern Florida, why do these reptiles literally fall out of trees when it gets cold? Use the term ectothermic in your explanation.
Part 2: Trait Tracker
As you watch the video, capture the key evolutionary adaptations for each category below.
SKIN (Keratin & Lipids)
REPRODUCTION (Ovi vs. Vivi)
RESPIRATION (Rib Cage)
SENSORY (Jacobson's Organ)
Part 3: Design a Reptile Challenge
Extreme Environments Only
Environment Choice
Species Name
Adaptation Labels:
1. SKIN ADAPTATION
2. RESPIRATION TYPE
3. SENSORY ORGAN
Sketch Area
Draw your creature here. Label your three adaptations with arrows!
Gallery Walk: Survival Scout
Walk around and analyze two peers' designs. Can you guess their environment?
PEER DESIGN 1
Adaptation Observed:
Predicted Environment:
PEER DESIGN 2
Adaptation Observed:
Predicted Environment:
Scaly Survivors Teacher Guide TEACHER GUIDE
Scaly Survivors: Reptile Adaptations
Grades 6-8
Learning Objectives
Identify the four major orders of Class Reptilia.
Explain how keratin-rich skin and rib-cage breathing assisted in the move to land.
Analyze the impact of being ectothermic on animal behavior and survival.
Justify physiological adaptations for extreme environmental stressors.
Lesson Timeline
00-05 min Warm-up: Falling Iguana Discussion
05-20 min Video Viewing & Trait Tracker Completion
20-40 min Activity: Design a Reptile Challenge
40-50 min Gallery Walk & Reflection
Materials List
Scaly Survivors Slides
Scaly Survivors Worksheet (1 per student)
Colored Pencils (Assorted Sets)
Tape (for Gallery Walk)
Trait Tracker: Answer Key
Skin
Keratin-rich and waxy lipids make skin water-tight. Helps with water retention and heat preservation, especially in arid deserts.
Reproduction
Oviparous (egg-laying) or Viviparous (live birth). Amniotic eggs allowed for life completely out of water.
Respiration
Rib-cage breathing. Uses muscles to push air in/out of lungs. Unlike amphibians who "gulp" air.
Sensory
Jacobson’s Organ (Squamata). Used to sense chemicals (smell) in the air using the tongue.
Key Video Moments
02:58
Pause Point: Ask students to define 'Ectotherm' from memory before the screen shows it.
05:45
Discussion: How might rising global temperatures (Climate Change) affect species with temperature-dependent sex determination?
07:29
Check-in: Why do snakes stick their tongues out? Ensure students understand it is for smelling, not tasting.
Activity Guide: Design a Reptile
Scaffolding Tips
Encourage "Arctic" students to think about the Tuatara (active in lower temps).
For "Volcano" students, suggest skin that reflects heat or resists thermal damage.
Remind students that respiration must still use lungs, but might involve unique gas exchange filters.
Gallery Walk Instructions
Have students tape their worksheets to their desks or the wall. Give each student 2-3 minutes to rotate. They should use the "Survival Scout" section of their sheet to analyze their peers' work without looking at the "Environment Choice" label first.
