[Espy]

How are birds and cogwheels related?

Uhhhh hrrgkhh I was gonna say they both have teeth, but birds... don’t have... teeth...

Anyways my bullshit answer is, they both have parts that mesh with each other; for example, gear teeth mesh with other gear teeth, while the barbules of a single barb on a bird’s feather mesh with the barbules of the barb next to it (which is why feathers hold together like that; it works like velcro.)