Crabby Teachers

 Lesson Two

Year Target : 2-4   Duration: 30 Minutes   Key Learning Areas: Language, Science

Materials:

Butcher's Paper/Whiteboard notes from last lesson; Pictures/photos of marine and land hermit crabs such as those from Sue Fox's Hermit Crabs: Complete Owner's Guide; the book "Pagoo" or another hermit crab oriented book.

Objectives:

To revisit previous lesson and learnings about land and marine hermit crabs. To extend on that with more facts about where a hermit crab lives, what it eats and the lifecycle of a hermt crab.

Content

  • Introduction - revist previous lesson
  • Exposition : hermit crabs - a closer look

  • Discussion - where does a hermit crab live?

  • Exposition - lifecycle of a hermit crab

  • Story - "Pagoo"

  • Q&A time

Sequence of Activities:

 

Introduction:

"Yesterday/Last week/Last time we learnt about hermit crabs. What do you remember about hermit crabs? What were the two types of hermit crabs we talked about?"

  • [Show listed information on paper/whiteboard from last lesson about land and marine hermit crabs]

    "Today we will be learning more about hermit crabs, such as where they live, what they eat and read a story about a marine hermit crab called Pagoo."

    Discussion:

    "Who can tell me where a marine hermit crab lives?"

    [In the ocean and in rockpools - show picture of marine hermit crab in water/ocean]

    "That's right. The marine hermit crab lives in water. They are often seen in rockpools and on the beach."

    "Who can tell me where a land hermit crab lives?"

    [On land / in trees / among the leaf litter / in sand . Show students a picture/photo of hermit crab in the wild among leaf litter/climbing trees/on sand]

    "Yes, land hermit crabs live on land. Some live in trees and many hide in leaf litter during the day to keep out of the heat of the day and stay safe from other animals. Land hermit crabs can drown in water because they have lungs like we do, not gills like marine hermit crabs."

    Exposition:

    "Land and marine hermit crabs both start their lives in the ocean, where they spend around a year growing, moulting and develop into mature hermit crabs. The land hermit crab leaves the water to live on land. It loses its ability to breathe under water and develops lungs to breathe air with. Marine hermit crabs spend their life in the ocean and in rock pools, sometimes they wander on beaches in search of food. Land hermit crabs often live more than one kilometre away from the ocean. Most only return to the water's edge to release eggs into the ocean and to find shells."

    Story :

    Read the book "Pagoo"

    [if necessary, over a series of lessons].

    Note: Pagoo tells the story of a marine hermit crab who grows from a baby hermit crab, a zoea, into a mature hermit crab over a period of time. It also covers issues such as borrowed shells, molting, food and marine life.

    Question and Answer time:

    Give students some time to ask questions or talk about the story and/or other things they have learned today.

    Conclusion :

    "We have learned many things about hermit crabs today. We have learned that some hermit crabs live on land while others live in the sea. We have looked at photos of hermit crabs and listened to the story Pagoo. Next lesson/week/time we will learn more about the land hermit crab and study it closely. We will also be learning the names of body parts of a hermit crab."

Extentions:

  • Lesson Three introduces the stages of development a hermit crab goes through, from egg/larvae to Zoeae to Glaucothoe to Juvenile Crab. It extends what students have learned today and introduces the anatomy of land hermit crabs.
  • If you had time you could watch "Dragons of the Galapagos" and compare the land and marine dragons of Galapagos islands. The land dragons live on land and have adapted to a land life. Marine iguanas dive deep within the waters and eat seagrasses and return to the rocks to bask.

Notes:

Year level was targeted at Years 2-4 (ages 7-10) but you can adapt the lesson to fit the class. If you cannot get access to "Pagoo" then modify the lesson plan to reflect the content of the story book you do read.

http://users.tpg.com.au/users/vanessap/hermit/lessons/lesson2.html

 
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