See how swallows build their nest
Simply put, swallows can accomplish all of this through teamwork and cooperation. Firstly, the male and female must work together to build the initial foundation of the nest. The male will typically build the main body of the nest, while the female wraps her material around it in an intricate way. Together, they fashion the nest into a complete and sturdy unit.
Good detail of the nest! I love watching swallow fly!