Four new books on animal ethics have been published and added to a series on the subject.

The Palgrave Macmillan Animal Ethics Series now features more than 40 volumes following the recent additions.

It explores the challenges animal ethics poses, both conceptually and practically, to traditional understandings of human-animal relations.

Professor Andrew Linzey, director of the Oxford Centre for Animal Ethics and co-editor of the book series, said: "Interest in animal ethics is booming among academics.

“We have created a new library for students and scholars, as well as providing resources for emerging courses in animal studies."

The new additions include Kimberly C. Moore's 'The Case for the Legal Protection of Animals'.

'The Case for the Legal Protection of Animals' by Kimberly C. Moore'The Case for the Legal Protection of Animals' by Kimberly C. Moore (Image: Panpathic Communications)

It presents the case based on humanity’s shared interests with the animal kingdom.

'Animals as Experiencing Entities', edited by Michael J. Glover and Les Mitchell, is a collection of essays focusing on the issue of animal subjectivity.

'Animals as Experiencing Entities' edited by Michael J. Glover and Les Mitchell'Animals as Experiencing Entities' edited by Michael J. Glover and Les Mitchell (Image: Panpathic Communications)

It explores the experiences of those with little or no power - usually animals.

There is also 'The Suffering Animal' by Simone Ghelli, which provides a reassessment of the debate on the human-animal relationship.

'Animals, Ethics, and Language' by Rebekah Humphreys'Animals, Ethics, and Language' by Rebekah Humphreys (Image: Panpathic Communications)

The final new release is 'Animals, Ethics, and Language' written by Rebekah Humphreys.

This book maps the central debates surrounding anthropomorphism in relation to our descriptions of animals, their lives, and meaningful communication in the nonhuman world.