ds is currently on yellow band books. This weekend he has come home with this non fiction book 'the snail' a heinemann first library bug book. www.amazon.co.uk/Bug-Books-Paperback-Chris-Macro/dp/043101681X/ref=sr_1_4?s=books&ie=UTF8&qid=1319958481&sr=1-4
It's much, much longer than the ones he usually has. It's 32 pages with 3 or 4 sentences to a page. However, he has read it without any problems (not all in one go though) so maybe it is a yellow one?
An example page reads:
Snails come in different sizes and have shells of different colours. Some snails are very small. Some snails are very big. This is a giant African land snail. It can grow to be longer than your foot!
Is this yellow, has he been moved up a band or is it a mistake?