While many birds have basic brown or black bills, a few species have beaks that look like they’ve been dipped in rainbow paint. These birds don’t just use their beaks for eating or survival ...

A shared shape rule, the power cascade, governs most bird beak growth. It links modern birds with extinct dinosaurs.

Kathleen Garland receives funding from the Australian Government, Monash University and Museums Victoria. Alistair Evans receives funding from the Australian Research Council and Monash University ...