The feather is one of the most astonishing pieces of technology invented by the natural world, and for centuries, this feather has helped birds to keep dry, to keep warm and even power flight.
A pena é uma das tecnologias mais impressionantes já inventadas pela natureza e, durante séculos, a pena ajudou as aves a permanecerem secas, a se manterem aquecidas e até a voar.