When a litter of dogs, for instance, consists of only two offspring, people tend to refer to the two puppies as twins. Twins ...

Being a mother is a tremendous accomplishment and one of the most challenging jobs in the world. This applies even in the animal kingdom, where it can be a literal dog-eat-dog world for many species.

Research led by Dr. Kirsty Macleod from Bangor University's School of Environmental and Natural Sciences found that lizards whose mothers experienced stress during pregnancy grew more slowly and ...

This article is republished from The Conversation. Ask any parent—welcoming a new baby to the family is exciting, but it comes with a lot of work. And when the new addition is a pair of ...