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Grade 3 (age 8-9)

Animal Life Cycles

Animal Life Cycles

Animals are born, grow up, and have young of their own, and so the life cycle continues. A butterfly changes from egg to caterpillar to chrysalis to adult, while a frog and a chicken grow through their own stages. A pupa stage, like the butterfly's, means complete metamorphosis; growing with no pupa, like a grasshopper, is incomplete. Here you can choose an animal to follow its life cycle around the circle and compare the two kinds of metamorphosis.

What is an animal life cycle?
🦋 What is a Life Cycle?
①The process of an animal being born, growing, and reproducing
②Butterfly: egg→caterpillar→chrysalis→butterfly (complete)
③Frog: egg→tadpole→frog (metamorphosis)
④Chicken: egg→chick→chicken (growth)
Types of Metamorphosis
💡 Types of Metamorphosis
①Complete: has a chrysalis stage (butterfly, bee, ladybug)
②Incomplete: grows without chrysalis (grasshopper, dragonfly)
③Body fully transforms inside the chrysalis
④Not all animals undergo metamorphosis
Summary
Complete Metamorphosis
Egg → Larva → Pupa → Adult
Butterflies, ladybugs, bees — pass through a pupa stage
Incomplete Metamorphosis
Egg → Nymph → Adult
Grasshoppers, dragonflies, cicadas — no pupa stage
🎯 Key Points
①Life cycle: born, grow, reproduce
②Complete metamorphosis has a pupa stage
③Incomplete grows without pupa
④Birds and mammals do not metamorphose
⑤Each stage has different food and lifestyle
Examples and Unit Test
Example 1
Put the butterfly life cycle in the correct order using egg, larva, pupa, and adult butterfly.
1
A butterfly goes through complete metamorphosis, which includes a pupa stage.
2
The order is egg → larva → pupa → adult butterfly.
Egg → larva → pupa → adult butterfly
Complete metamorphosis goes egg → larva → pupa → adult.
Example 2
How are the life cycles of a butterfly and a grasshopper different?
1
A butterfly goes through complete metamorphosis, with a pupa stage.
2
A grasshopper goes through incomplete metamorphosis, becoming an adult straight from the nymph with no pupa stage.
Butterfly = complete metamorphosis (with pupa) / grasshopper = incomplete (no pupa)
A pupa stage means complete metamorphosis; no pupa means incomplete.
Unit-test style
Which statement about animal life cycles is correct?
Every insect goes through a pupa stage
A butterfly goes through complete metamorphosis with a pupa stage
A grasshopper has a pupa stage
A chicken goes through metamorphosis
A life cycle begins only once the animal is an adult
② A butterfly goes through complete metamorphosis with a pupa stage
1
A butterfly goes egg → larva → pupa → adult, which is complete metamorphosis.
2
Some insects like grasshoppers have no pupa stage (① and ③), a chicken just grows from a chick without metamorphosis (④), and a life cycle begins at birth (⑤).