We've been reading What Mr Darwin Saw by Mick Manning and Brita Granstrom.  Here is a diary entry written by Darwin (in fact it's Grace, but you get the idea) when he was aboard HMS Beagle:
                                                                                                                                     

                                                                                                                   September 1835

Dear Diary,

                             I am now on the Galapagos Islands, one of the stops on my 5 year voyage. The men are just weighing anchor as I write. I have a theory and it is that man transformed slowly but eventually from Chimpanzee to human. Most people disagree with my view of the world because it rebels against what the church says, like God made Adam and Eve and we descended from them. Even if people still believe in Adam and Eve I hope at least someone will think twice about my way of thinking. Jack (my good friend) has just spotted a giant tortoise, a group of tortoises, on the shore heading into the main land. They say there are two types of tortoise with different shaped shells. I must go now to study them.      

 

By Grace (Yr6)