Flying insects begin life as eggs, which hatch into larvae that feed and grow rapidly. After transforming inside a pupa, adult insects emerge capable of flight. They spread by flying, being carried by wind, or hitching rides on vehicles, plants, and goods. Many species lay hundreds of eggs in different environments, allowing rapid population growth. Warm weather, food sources, and standing water provide ideal breeding conditions. Human activities, such as travel and trade, also help them reach new regions. Because of their short life cycles and high reproductive rates, flying insects can multiply and spread quickly across large areas.