This was a wonderfully fun introduction into the lives of these three outstanding women. As several other people have mentioned, it's not technically a nonfiction biography but does contain the basic facts about these women and their incredible devotion to their science. It also has a very helpful appendix that lists websites, books and articles for further discovery. 
 For me, one of the most interesting things was the belief held by Dr. Leakey that women were more patient and more suited to the painstaking research necessary for these studies. This was an unusual belief for this era. This is a great resource for helping encourage girls who are interested in science, math and research. 
 The illustrations were very fun with facial expressions that really added another dimension to the story. My only issue was that the abbreviated text sometimes led me to be confused about what was going on. I frequently thought that I had skipped a page because some segments didn't make sense. But, that was a minor issue andI would highly recommend this book for school libraries and animal lovers.