I wasn't going to review because the others nailed it, but I have to add that beyond this being an amazing series among multiple planet earth series, there is some heart wrenching. In one they show a baby elephant calf die and if that doesn't rip your heart out I don't know what will. I've watched almost all of the series and there is natural life and death, but the one with the elephant was probably the worst. No way I could have filmed it without helping.