Yellow-bellied

Yellow-bellied may refer to:

In ornithology:

Yellow-bellied Elaenia, small bird of the tyrant flycatcher family
Yellow-bellied Fantail, fantail found in southern Asia
Yellow-bellied Flycatcher, small insect-eating bird of the tyrant flycatcher family
Yellow-bellied Sapsucker, medium-sized woodpecker
Yellow-bellied Siskin, small passerine bird in the finch family Fringillidae

In other fields:

Yellow-bellied Marmot, ground squirrel in the marmot genus
Yellow-bellied toad, toad belonging to the order of Anura
a colloquial term for cowardice