Wiktionary
sole providers
n. (sole provider English)
Usage examples of "sole providers".
As we shall see, these inherited commitments help explain why there is no mammal species in which parental care is provided solely by the male, even in habitats where mammals live alongside fish and frog species whose males are the sole providers of parental care.
From the scroll, I could not tell if they were worried for her well-being, or frantic at having become the sole providers for several earth-bound dragons.