The discovery of an ancient fossil, nicknamed 'Mrs T', has allowed scientists for the first time to sex pterodactyls -- flying reptiles that lived alongside dinosaurs between million years ago. Pterodactyls featured prominently in Spielberg's Jurassic Park III and are a classic feature of many dinosaur movies where they are often depicted as giant flying reptiles with a crest. The discovery of a flying reptile fossilised together with an egg in Jurassic rocks about million years old in China provides the first direct evidence for gender in these extinct fliers. This fossil shows that females were crestless, solving the long-standing problem of what some pterosaurs did with their spectacular head crests: showy displays by males. The find was made by an international team of researchers from the Universities of Leicester, Lincoln and the Geological Institute, Beijing.