However, P. gambensis developed unique environmental adaptations, which resulted in the evolution of several anatomical features that are not shared with other anatids; thus, the species has been classified one step further into its own subfamily, the Plectropterinae.

[7] Another South African-based study found 58 males weighing an average of 5.52 kg (12.2 lb) and measuring 98.1 cm (38.6 in) in total length; meanwhile, 34 females averaged 3.35 kg (7.4 lb) in weight and 84.2 cm (33.1 in) in total length.

Typically, only males make a call, which consists of a soft bubbling cherwit when taking wing or alarmed.

Varied sites may be used for post-breeding moulting, in which case large numbers of the geese may congregate.

This common species feeds by grazing, but spends the middle part of the day resting by water.

Its diet consists predominantly of plant matter such as the vegetative parts and seeds of grasses, sedges and aquatic plants, agricultural grains, fruit (e.g. figs) and tuberous crops, although it may occasionally supplement its diet with small fish or insects.

At this time of the year, the geese may violently put the spur on the bend of the wings to use in conflicts with other birds.

Generally, they prefer quiet, undisturbed stretches of riverbank and wetlands for nest sites.