A pair of sloth bear cubs were born at Smithsonian's National Zoo last month, on Dec. 7, the zoo shared in a press release.

For the first time since 2014, keepers at the Smithsonian’s National Zoo and Conservation Biology Institute (NZCBI) have ...

Biology has always been an unruly science. Cells divide when they want to. Genes switch on and off like temperamental lights.

Experts discussed common pregnancy-checking methods, including palpation, ultrasound and blood-based tests, noting that each ...