It owes much to the work of philosopher Peter Singer and his 1975 book 'Animal Liberation'. Animal lovers would say that all animals deserve moral consideration. This doesn't help resolve cases ...

In his book Animal Liberation, the philosopher Peter Singer made a powerful case against speciesism—the belief that humans are inherently superior to other types of animals. He wrote ...

"Pet speciesism" explains why Americans spend 20 times more on the care and feeding of their pets than they donate to the cause of animal protection.