From an evolutionary standpoint, it’s ruthlessly efficient. The queen collects sperm from multiple drones in one flight, stores it for years, and then spends her life laying up to 2,000 eggs a day.

A clan of spotted hyenas on the move pass a buffalo herd.

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...