Most people now keep animals as pets. Numerous people have cats and dogs in their house. Other people like fish, caged birds and even snakes, monkeys or lions. Millions of dollars and much time are spent every year on pet food, equipment, training and medical treatment. Of course, there are some people who do not look after their pets properly or are even cruel to them. For this reason a royal society was created in 1824 in Britain to prevent cruel treatment of animals. In contrast to the love of pets is the fact that blood sports still exist in most countries. People go hunting foxes, elephants, and other animals, or go fishing, not because they need the meat to eat, but just for pleasure. In some countries, blood sports like bull fighting and cock fighting are common and hunting rare animals for money has brought about an even more serious problem in the protection of the ecosystem. (生态系统) It is strange that people love certain animal, but enjoy killing others, in cruel ways, too.