The world's oldest known killer whale, affectionately known as Granny, is missing and presumed dead, researchers say. Estimated to be over 100 years old, the matriarch's official name was J2.She was the focal point of a recent BBC documentary that followed biologists' study of her clan of orcas, an effort to unravel an evolutionary mystery. Studying female orcas, which live long beyond their reproductive years, has revealed insights into the menopause.
From @artists