Bug Lab Teacher Guide Teacher Guide
Monster Bug Lab
2nd Grade Math & Science: Measuring the Giants
Learning Objective
Students will estimate and measure length (cm) and weight (g) using standard units by comparing classroom objects to three "monster" insects: the Titan Beetle, Giant Weta, and Atlas Moth.
Materials
Balance Scales (Station A)
Pennies (75+ per station)
Rulers (Metric)
Bug Ruler Reference Sheet
Student Worksheets
Lesson Timeline
5 MIN
Warm-up: The Weight Guess
Engage students with a physical estimation challenge.
Show a bag of 25 pennies. "If a giant bug was this heavy, would it be light or heavy?"
Pass a bag of pennies around. Have students guess what classroom object might weigh the same.
5 MIN
Viewing: Meet 3 Giant Insects!
Watch the SciShow Kids video (URL in Slides).
Titan Beetle: 16 cm (long).Giant Weta: 70 g / 25 pennies (heavy).Atlas Moth: 30 cm wingspan (wide).
25 MIN
Activity: Measure the Monsters
Split the class into three rotating stations (8-9 mins per station).
Station A: Weight
Use balance scales. Put 25 pennies (70g) on one side. Compare to erasers, glue sticks, and pencils. Record if they are heavier or lighter than a Giant Weta.
Station B: Length
Use the Bug Ruler Reference. Measure objects against the 16cm Titan Beetle line. Record items that are shorter, longer, or "just right."
Station C: Width
Measure hand spans using a metric ruler. Compare to the 30cm Atlas Moth line. How many hands wide is the moth?
10 MIN
Closure: Scientist Circle
Regroup for a concluding discussion.
Which insect was the most surprising? Why?
What is one thing that is exactly the same size as an Atlas Moth?
Expert Notes
Station Setup Tips:
Pre-bag pennies into groups of 25 to save time. Mark the 16cm and 30cm lines on butcher paper if the printed reference sheets are too small for group work.
Misconception Alert:
Remind students that "Titan" doesn't mean "scary." Emphasize that these bugs are mostly gentle and play important roles in their habitats (like cleaning the forest floor).
Monster Bug Lab Slides Monster Bug Lab
2nd Grade Measurement Mission
The Weight Guess
A Giant Weta weighs as much as
Do you think that's heavy for a bug?
Meet the Giants
Embedded media
Watch for: 16cm, 70g, and 30cm!
The Titan Beetle
16 Centimeters
That is longer than a dollar bill !
Super strong jaws
Sharp spines for defense
0cm |--------- 16cm ---------|
Can snap a pencil in half!
The Giant Weta
70 Grams
It's as heavy as 25 pennies !
Heavier than a mouse
Cannot fly or jump
70g = 25 Pennies
The Atlas Moth
30 Centimeters
The size of a standard ruler !
"Snake's Head" wing tips
Doesn't eat as an adult
0cm |------------------- 30cm -------------------|
Wider than most books!
Measurement Mission Stations
A: Weight
Compare classroom items to 25 pennies .
B: Length
Measure items against the 16cm Titan Beetle .
C: Width
Compare your hand span to the 30cm Moth!
Scientist Debrief
Which insect was the most surprising to you?
Which one would you want to find in your backyard? (Don't worry, they are gentle!)
Measurement Mission Worksheet Measurement Mission
Monster Bug Lab • 2nd Grade Science
Name:
Date:
Station A: The Heavy Hitter
Target: 70 Grams (25 Pennies)
The Giant Weta weighs as much as 25 pennies. How do classroom items compare?
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Station B: The Long Crawler
Target: 16 Centimeters
The Titan Beetle is 16 cm long. Measure items and write their length!
Item 1:
Length:
cm
Item 2:
Length:
cm
Station C: The Wide Flyer
Target: 30 Centimeters
The Atlas Moth has a 30 cm wingspan. Measure your hand span (from thumb to pinky!).
My Hand Span
cm
Which is wider?
Me
OR
The Moth
The Giant's Sketchpad
Pick your favorite bug and draw it as big as you can in this box!
Bug Ruler Reference Sheet Bug Ruler Reference
Teachers: Ensure "Actual Size" is selected when printing for correct scale.
1 cm
Calibration Square
The Titan Beetle
Length: 16 Centimeters
0 cm
5 cm
10 cm
15 cm
16 cm
This beetle is longer than a dollar bill!
The Giant Weta
Weight: 70 Grams
25 Pennies
Fact Check:
One penny weighs about 2.5 grams. 25 pennies is exactly 62.5 grams—add the bug's body weight, and you hit 70g!
Heavier than a mouse!
The Atlas Moth
Wingspan: 30 Centimeters
Too wide for this paper!
Use your full classroom ruler to see how wide this moth is.It covers the whole ruler!
