"I've spent a fair amount of time reading many of the free, or kindleunlimited, or at least inexpensive, children's non-fiction Kindle books, and this series by Cindy Bowdoin, (of which this is a fine example), is in the top three of my discoveries. Jacob Smith has a series of about a dozen biographies, (Edison, Lincoln, Neil Armstrong, Helen Keller, and so on), and Karen Darlington has a series of about fourteen animal focused "All About..." books, but once you get beyond them the pickings get slim quickly.
This book bundles dolphins and polar bears, which is an interesting pairing, (I guess, technically, they are both ocean mammals). It's not as idiosyncratic as my favorite pairings - sharks & tigers, and butterflies & owls. This is part of the "blue" set aimed at 6 to 8 year olds. There is also a "red" set, which is not aimed at Republicans, but rather at older kids.
Like the Smith and Darlington series, and unlike the less successful books, this book is crisp, clear and matter-of-fact in a personable sort of way. It isn't just random factoids and stock photos, but rather feels more like a lesson than moves logically from topic to topic. Because it's written for a younger reader there is a bit more emphasis on mothers and baby animals, but that was fine by me.
As I understand the prevailing wisdom, the idea isn't so much to make kids experts on certain topics. The idea is to introduce them to fact-based non-fiction reading and to get them some experience with learning things through reading. That strikes me as sensible. I have been pleased and a bit surprised by my little readers' requests for nonfiction reading material to supplement their books about fart-based adventures.
So, if you and your little reader want to sample some non-fiction, and if cool animals are appealing, this could be a nice, entertaining and rewarding choice." Pop Bop said.