We are always on the hunt for non-fiction beginning reading books.  Our daughter really loves learning about the world around her.  Astronomy and animals have both particularly captured her interest.  Usborne does a great job with their beginning readers.  Many are non-fiction and they include bright, colorful pictures and text which is a bit larger which makes for easier reading for a preschooler. 

Frogs is part of the Usborne First Reading Series.  It includes details about how frogs grow from tadpoles to adult frogs and how they eat, swim, and keep safe.  The illustrations are charming and help to bring the text to life for the reader.