They have specific calls for a variety of circumstances, such as to warn of potential threats, to defend territory, to feed, to attract mates and to communicate between parents and offspring. If you chirp to hummingbirds when you put out hummingbird feeders, they may chirp back.
What is the clicking sound hummingbirds make?
Vocal sounds are made with the voice box but the non-vocal aerodynamic sounds are made with their wing and tail feathers. Sometimes male hummers fight for territory by dueling with their beaks and creating the clicking sound you may have heard.
Do hummingbirds sing or chirp?
Hummingbirds have relatively weak vocal cords and most species only make chirping and chattering sounds. They have different calls / songs for when they are excited, defending their territory, wowing potential mates or simply when flying from flower to flower.