The mouse-sized creature called a Krusatodon was replacing its baby teeth with its adult teeth when it died and was a juvenile. Its ancient teeth-changing indicates that small early mammals may ...

It's nearly impossible to escape the influence of 3-month-old baby hippo Moo Deng. Over the span of a week, Moo Deng drew in millions of online admirers. The charismatic animal, whose name means ...

New research reveals that pregnancy-related brain impairment is present in live-bearing fish, but instead of affecting ...