Follow the narrator as he takes us through the good and bad aspects of micro-organisms in this fun rhyming poem by Sam McBratney, explaining that while these unseen bugs can ruin food and make us ill, they also keep our world under control, by rotting food and plants that we no longer need. Lively illustrations by Eric Smith accompany the poem.

Collins Big Cat supports every primary child on their reading journey from phonics to fluency. Top authors and illustrators have created fiction and non-fiction books that children love to read. Book banded for guided and independent reading, there are reading notes in the back, comprehensive teaching and assessment support and ebooks available.

Collins Big Cat supports every primary child on their reading journey from phonics to fluency. Top authors and illustrators have created fiction and non-fiction books that children love to read. Book banded for guided and independent reading, there are reading notes in the back, comprehensive teaching and assessment support and ebooks available. Collins Big Cat is a whole-school reading programme that provides complete support for primary reading. Children will become fluent readers through hundreds of high-quality fiction and non-fiction banded books by award-winning authors and illustrators. In-depth teaching resources support you in developing and assessing key reading skills at all stages from early reading through to phonics, to guided, whole-class and independent reading for more confident readers.