Leonardo da Vinci closely observed the anatomy and flight of birds  proposed "flying machines"... known today as an aeroplane-https://www.learnbiomimicry.com/blog/best-biomimicry-examples

Swiss engineer named George de Mestral was out hunting with his dog when he realized small burrs from the burdock plant were stuck to his dog’s hair. On closer inspection, he realized that these tiny hooks and loops can be made into clothing or garment fasteners which led to the discovery of velcro -https://www.learnbiomimicry.com/blog/best-biomimicry-examples

Researchers in 2008, mimicking the mosquito, developed a 3 prong needle that significantly reduced the pain caused by needle insertion. The methodology is improving and science is getting ever closer to mimicking those pesky bugs in a good way.---https://www.learnbiomimicry.com/blog/best-biomimicry-examples

model flippers reduced drag by 33% and increased lift by 8%. Whale Power, Canada, has already implemented them on their wind turbines and this has increased the efficiency by over 40% over the traditional wind turbine in some cases.---https://www.learnbiomimicry.com/blog/best-biomimicry-examples