Menopause is rare among animals. Why do orcas go through it?
Studying fin scrapes in a closed group of orcas shows that postmenopausal mothers put energy into helping their sons, but not daughters or grandchildren.
This 'lost world' reveals a new chapter in the evolution of life
The origin of complex organisms called eukaryotes—which includes all animals, plants, and fungi—is one of biology’s biggest mysteries. A new discovery helps reveal these evolutionary roots.