"In keeping with the high standards set by Bobbie Kalman the Earth's Endangered Animals books are powerful non-fiction reading for upper elementary children....The photographs, diagrams, and sketches are, as usual, bright, uncluttered, and focused on the aspect being discussed....The web sites are easy to access, and the suggestions are doable without being condescending. The Endangered series would be an excellent place to begin a first research project. The books reviewed would be welcomed in any elementary or middle school library."