Humans. 

 #mine:photoset  #Doctor Who  #I really love this PSD a lot okay  #Also that first gif was being annoying  #Eleventh Doctor  #But can I just talk about this gifset for a minute though?  #The Doctor treats Earth and the human race as his second family of sorts  #He travels almost entirely with humans and he spends quite a lot of time on earth  #He loves humans and has made that very clear  #Especially during The Eleventh Hour when the Atraxi questions him about Earth  #And he says No but I've put a lot of work into it or whatever it was  #So it's really curious to see how the Doctor's character has evolved over time  #In Eleven's beginning he was still a bouncy little puppy  #He loved everything and particularly his curious little humans  #But as his character continues to grow I guess he starts to become more weary?  #I'm not really sure what it is but there is a noticeable change in his character  #It's not so much that he grows more skeptical of the humans  #More that he knows he's going to die I guess  #So he starts to finally put himself first instead of his humans  #I don't even know if I'm making sense anymore but let me continue  #In TIA he knows he's about to die  #So he remarks longingly about the humans that he loves so much  #Resigning himself to the fact he's going to die and leave Earth behind as a WIP  #But in Closing Time he's preoccupied with himself and his Farewell Tour  #Pretending that he doesn't care about his humans because he's going to leave them and pretending he doesn't care would make leaving them ...  #a lot easier  #But in the end he really does care and helps Craig save the earth from the Cybermen  #So I guess in true tl;dr versions  #The Doctor loves the Earth and the human race  #They're probably his favourite species