Final answer:
Samuel Gosling discovered that animals exhibit personality traits, similar to humans. Trait theorists believe that all people and animals have certain characteristic ways of behaving.
Step-by-step explanation:
Samuel Gosling discovered that animals exhibit personality traits, similar to humans. Trait theorists believe that all people and animals have certain characteristic ways of behaving. These traits can vary from being sociable or shy, passive or aggressive, optimistic or pessimistic, moody or even-tempered. Gosling's research suggests that animals, like humans, can exhibit a variety of personality traits.