Like other geese, Orinoco Geese are primarily vegetarian, eating aquatic plants and related vegetation, as well as terrestrial grasses. They may also feed on small insects, crustaceans and worms.
Females incubate the eggs, with the male staying nearby to actively defend the nest. Both parents take part in rearing the young, which hatch in 28–32 days. Normal clutch size is 6–10 eggs. Orinoco Goose populations tend to fluctuate in captive collections, often becoming scarce, then gaining in popularity.