Researchers from the University of California, Berkeley have discovered how bird feathers resist tearing, a finding that could lead to new materials for body armor, parachutes, and other applications.

The team, led by materials scientist Robert Ritchie, studied the microstructure of bird feathers using a variety of techniques, including scanning electron microscopy and X-ray diffraction. They found that the feathers are made up of a hierarchical structure of interlocking barbules, which are tiny barb-like structures. These barbules are connected by a network of collagen fibers, which act like tiny springs to absorb energy and prevent the feathers from tearing.

"The hierarchical structure of bird feathers gives them a unique combination of strength and flexibility," Ritchie said. "This is why feathers can withstand the high stresses of flight, and why they are so effective at keeping birds warm."

The researchers believe that the design of bird feathers could be used to create new materials with similar properties. These materials could be used in a variety of applications, such as body armor, parachutes, and sails.

"The potential applications of this research are endless," Ritchie said. "We are excited to explore the possibilities and to see what new materials we can create."

The research was published in the journal Nature Communications.