Having the belly white: specifying many birds and other animals.
The Century Dictionary (Public Domain)
Use "white-bellied" in a sentence
"As they struggle up the river in a canoe, guided by an old man and a young boy, the reporters encounter nightmarish scenes of devastation: "dead birds draped over tree branches, their outstretched wings black and slick with oil; dead fishes bobbed white-bellied between tree roots"."
"Sidestepping a lifeless white-bellied frog, we forge ahead, holding hands like teenagers."
"Birds found here and in only few other places include white-bellied seedeaters Sporophila leucoptera, grassland yellow-finches Sicalis luteola, chalk-browed mockingbirds Mimus saturninus, tropical peewees Contopus cinereus, rufous-throated antbirds Gymnopithys rufigula, black-breasted puffbirds Notharchus pectoralis, and plain-bellied emeralds Amazilia leucogaster."