Picture books about Australia for preschool and kindergarten. Use with Apologia's Around the World (multi-level) History and Geography homeschool geography, homeschool history
Australia Unit - Learning about Australian Animals
First Grade Life Science Worksheets: Australian Animal Tracks
Free 60 page printable packet on Australian animals. While these are geared to a child younger than those who typically do Sonlight's Core F, they'd be excellent to give to a younger sibling who may be tagging along.