Why birds take on a streamlined shape to dive into water and catch fish?

Birds have evolved a streamlined shape to reduce air resistance and enhance their diving efficiency when catching fish. This aerodynamic design allows them to plunge into the water with minimal drag, enabling faster and more controlled dives. Additionally, a streamlined body helps them quickly transition from air to water, improving their chances of successfully catching prey while minimizing energy expenditure. Overall, this adaptation is crucial for their hunting strategy and survival.