A nest of black phoebe baby birds was built on our property in a particularly hot area up against a wall of the house. After seeing the parents leave for a while, the baby birds looked overheated and started "panting" or opening their mouths. I sprayed them with some water, and they seemed to appreciate it. All three birds made it successfully into adulthood, and I documented their growth with other videos (yet only intervened this one time). We watched them leave the nest and enjoy their bird lives.