Tarantula feet spin sticky silk

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Zebra tarantula from Costa Rica
(S. Niederegger and S. Gorb, Max Planck Society/ Nature)

“Tarantulas have microscopic nozzle-like structures on their feet that secrete a viscous silk-like filament.”

The discovery is the first evidence of a spider species that uses silk for locomotion.

How it wasn’t noticed before is something of a puzzle to me.