I didn't think it was possible but Planet Earth as done it again! It is a beautiful show that is great for my 4th graders. They do discuss mating but it is nothing that anyone needs to worry about. The area that I wanted to alert teachers to is that in the "Cities" section it mentions something along the lines of, "I guess it is hard to find sex in the city." Clearly they are talking about the show but it is not something I need my students hearing. Otherwise this show is AMAZING!!!