Even though I have moaned, I recommend ''The White Giraffe''. It's not perfect, but it's a sweet read with a very strong and consistent authorial tone. Children aged between 9 and 12, especially those with an interest in animals and the environment, will almost certainly love it.
Thanks to Orion for sending the book. You might also enjoy [[The Snow Angel by Lauren St John]].
Another book that will appeal to young animal and nature lovers is [[The Call of the Wild]] by [[:Category:Jack London|Jack London]].