I think Year 4 children would love this book.  It is also probably good as a read-aloud book for Year 4 children.

As a class activity, children could design their own alien. Decide what it eats, where it sleeps, etc.  They could also design a wanted poster and write a letter. They could also write a list of foods.

In fact, the children could even write their own book. They could include a section on farts and poops which would be particularly entertaining for them.

The children could also be taught about the need to draw simple characters so they can be replicated many times. In Olga and the smelly thing from nowhere there are so many illustrations.

(Copy copyright: By Western Australian Children’s author who enjoyed this book.)