1810-1891 1847-1931 animalbehavior animals animalwelfare apes barnum behavior biography captiveelephants circus circusowners circusperformers comparative edison electrocution elephants experiments fiction friendship gorilla gorillas graphicnovels history inventors jumbo jumbo(elephant) juvenilefiction monkeys newyorktimesbestseller nyt:childrens-middle-grade=2013-02-17 psychology secrecy socialaspects socialthemes topsy(elephant) treatment uncles unitedstates zooanimals zoos