Richardson has worked with big cats and relies on intuition rather than static rules. He has slept next to, fed, and lived with lions. Along with lions, he has worked with cheetahs, leopards, and hyenas. He prefers lions to any other big cat. His relationship with the animals, however, has not been an instant one. He has known most of the lions he works with since they were cubs. He still continues his bond with Tau and Napoleon, the lion brothers who were his introduction to big cats.
His unique relationship with the genus Panthera has dispelled many myths concerning the care of lions. Richardson demonstrates that lions and animals in general, have personalities, feelings, and are social creatures. His interaction with them shows that, with mutual respect, many species can coexist together. That does not mean there are no dangers; Richardson, throughout his career, has had many close encounters.