Terms for subject Saying containing stomach

English	Russian
an army marches on its stomach	голодный солдат опаснее врага (SirReal)
no one knows if a bird in flight has an egg in its stomach	одному Богу известно
no one knows if a bird in flight has an egg in its stomach	Либо дождь, либо снег, либо будет, либо нет
no one knows if a bird in flight has an egg in its stomach	Бабушка гадала, надвое сказала