We have quite a few books which came from my gran and were a part of my childhood. One of those books is "Little Black Sambo," the slightly politically incorrect story of a boy who goes walking through the jungle and meets some tigers on the way. At one point in the story the tigers are fighting and going "grrrr" and Grace has now started doing a kind of throat gurgling "grrrr" whenever the tigers growl. It is very sweet and brings a smile to our faces.