'Mini Marvels' is all about tiny animals from around the world. Meet a seahorse that's so small, it could fit on a fingernail! 'Oxford Reading Tree inFact' is a non-fiction series that aims to engage children in reading for pleasure as powerfully as fiction does.'Mini Marvels' is all about tiny animals from around the world. Meet a seahorse that's so small, it could fit on a fingernail! 'Oxford Reading Tree inFact' is a non-fiction series that aims to engage children in reading for pleasure as powerfully as fiction does.