Central to her most recent (2012) view on animal welfare is scepticism about whether science can establish that animals have consciousness and therefore its role in definition and measurement of animal welfare and suffering. Instead, her view is that good animal welfare rests on determining the needs and wants of animals, which do not require that they are conscious. These theses are presented in her book "Why Animals Matter: Animal Consciousness, Animal Welfare, and Human Well-being" (2012). Her views on animal consciousness have been criticised by evolutionary biologist Marc Bekoff, who argues that she too readily rejects anthropomorphic research on animals. She responded to the criticism by stating her position as "wrongly interpreted", and says that "my concern is to make the case for animal emotions as watertight as possible and thereby to strengthen it. That is the way science progresses and always has."