Each quill has up to 800 barbs, all of which are located on the first 4 mm of the quill's tip. The quills easily detach from the porcupine, allowing it to escape while the sharp hair remains ...

A feather's barbs are pulled apart, in a manner that was replicated using large-scale 3D-printed models. ... A microscope image of a feather's interlocking barbules.

CLOCKWISE FROM TOP LEFT: A compound microscope images shows interlocking barbs and barbules on the bird’s flight feathers. A view of a feather suspended in amber.

Each barb also features a row of hairlike barbules on each side. In modern flying birds, ... This creates an interlocking hook-and-groove mechanism that forms a strong, ...