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

Rescued from illegal captivity in Ahmednagar district by forest department in April 2025, injured rose-ringed parakeet ...

Bird beaks come in almost every shape and size—from the straw-like beak of a hummingbird to the slicing, knife-like beak of an eagle. We have found, however, that this incredible diversity is ...

Under these drastically changing conditions, the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds. Smaller finches with less-powerful beaks perished.