Take a close look at Romeo’s feathers. Those feathers to a eagle are like our teeth when we are young. They go bye bye and a new one grows in. Only difference is a eagle repeats this each summer.
Eagles and many birds molt during the hottest time of the year, usually August. The warmth allows them to shed feathers and not become hypothermic. Eagles try not use a lot of energy during this period. Molting zaps their energies. Most of a eagles energy goes to to keeping themselves warm. So during these hot periods they do not need to eat as often. So they can afford to stay still for longer periods of time.
In the winter they need to eat constantly as their heat output needs to increase due to the colder weather.
Think of it like a woodstove,in the summer when it’s warm out, you never use it,but in the winter when It’s cold outside,you use it all the time!