" The self-aggrandizing and widespread assumption that we humans have the full complement of all of the emotions possible to all animals on Earth–basically, that all the marbles belong to us–is not only unscientific but also childish. Do we know how it feel is sail on an updraft in the sky, to echolocate our dinner in the dark, or to see at lightning speed with a compound eye? Fortunately, human understanding is maturing, and we are learning that animals are emotional, thinking, and self-aware beings relative to the niche that they were born to occupy. "

― Else Poulsen , Smiling Bears: A Zookeeper Explores the Behavior and Emotional Life of Bears