This may be the most underrated documentary that I have ever seen before , it's just too good for an average rating of 7.2 only , I would say 9 and half actually ! It might even be the best docoumentry that I have ever seen and I just don't understand why it's rated 7.2 only , the photography deserves a 10/10 , its that good ! and even though I twice actually I was still blown away by the documentary upon my 2nd viewing , it basically shows how humans developed with time from being very primitive to our modern world , and it also shows how the natural world was affected by them , some of scenes some the documentary were also actually quite upsetting as they showed the negative affects of mankind on the natural world ; like how they killed of all the wolves in Europe which I think got extinct in the 1880s , and how wars and explosions damage the wildlife , so overall it's a must watch and is recommended for families , but some scenes may be upsetting for youngsters , so this is a truly unique documentary which I think deserves a lot more attention and should be seen by anyone who has time for it