The term 'Lion Chaser' is a job title given to someone who is responsible for the care and maintenance of lions in captivity. This includes providing food, water, and shelter, as well as monitoring the health and safety of the animals. The acronym ESS stands for 'Exotic Species Specialist, ' which is another name for a Lion Chaser. Exotic Species Specialists are highly trained professionals who have extensive knowledge of the behavior and needs of lions in captivity.