"Studying cows, pigs and chickens can help an actor develop his character. There are a lot of things I learned from animals. One was that they couldn't hiss or boo me"

In this quote, James Dean suggests that studying animals such as cows, pigs, and chickens can be helpful for an actor in developing their character. He believes that there are lots of things that can be learned from observing and studying animals. One lesson he mentions is that animals can not hiss or boo an actor, which can be seen as a contrast to human audiences who might reveal their disapproval or criticism. This could imply that animals are more accepting and non-judgmental, and a star can find out to be more positive and untouched by negative reactions by studying them. In general, Dean highlights the value of learning from animals and how it can favorably impact an actor's craft.