Which of these famous consumer products was NOT inspired by an observation from the natural world?

The natural world has inspired countless product innovations across industries. From velcro (inspired by burrs) to swimsuits modeled after shark skin, companies have looked to nature for sustainable and efficient design solutions. This phenomenon, called biomimicry, has revolutionized product development while creating more environmentally harmonious solutions. Test your knowledge about these famous nature-inspired products that have changed consumer markets!

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Velcro (inspired by how burrs stick to animal fur)
Speedo's Fastskin swimsuits (modeled after shark skin texture)
WD-40 lubricant (developed based on duck feather properties)
Shinkansen bullet train (nose design inspired by kingfisher birds)