Grade 3's WILL BE  Studying the Life Cycles

of some common Animals this year!

We will be looking briefly at some vertebrates from the Chordata phylum. Chordates all have a "notochord" in their body which acts to stiffen and maintain body shape. In vertebrates this notochord is a nerve cord surrounded by rings of bone or cartilage (i.e. a spinal chord).

We will also look at one invertebrate - an insect!

Vertebrates include fish, amphibians, reptiles, birds and mammals.


- cold-blooded animals that live and breathe in the water. Salmon have an interesting life-cycle! Look at the middle of this page to see a diagram of the life cycle of the salmon.


- cold-blooded animals start in water and as they grow older spend more time on land. Frogs and toads are members of this class and have an interesting life-cycle.


- cold-blooded animals covered with scales (i.e. snake, lizard, turtle, alligator, crocodile)


- warm-blooded animals that have some hair on their body, nurse their young and have a highly developed brain.


- warm-blooded animals with wings and covered with feathers

We will also be looking, in more depth, into one type of insect - the butterfly!

The life-cycle of the butterfly can be divided into four distinct stages.

You could set up a vivarium full of Painted Lady larvae. Want to know more about the Painted Lady - go ahead!

Learn the basic body parts of a butterfly!

Mr. Fawcett thinks this link on animals, may help your animal life-cycle research. Go check it out!

The Electronic Zoo is also a good place to get some good information on your chosen animal!

Return to Grade 3 Science!