The Canada goose is one of the best-known ducks in North America, and its biology reflects a high adaptive capacity. Its body is covered in dense, grayish-brown plumage, with a black head and neck contrasting with a characteristic white stripe on the cheeks. This species has a robust morphology, a long neck, and a flat bill adapted for picking vegetation. Its digestive system is efficient at extracting nutrients from a diet rich in plant fiber. It adapts to a wide variety of habitats, from natural wetlands to agricultural fields, urban areas, and parks.

During flight, their powerful wings allow for long migrations, and their broad lateral vision facilitates navigation and predator surveillance. They have a strong philopatric orientation: young return as adults to the areas where they were born. Their ecological flexibility and social behavior have been key factors in their expansion, both naturally and in territories where they have been introduced.

The Canada goose is known for its gregarious and territorial behavior. It lives in pairs during the breeding season and in large flocks the rest of the year. The species is monogamous, and pairs form for life, showing great parental cooperation. During breeding, the male acts as an aggressive defender of the nest while the female incubates. They are very vocal, communicating through a series of low-pitched sounds, such as trumpets and croaks, which indicate alarm, warning, or group coordination. During migration, they use a "V" formation, alternating leaders to conserve energy. In urban areas, they have demonstrated a high degree of tolerance to humans and can modify their feeding and movement patterns depending on human presence. During molt, they temporarily lose their ability to fly and congregate in areas with good water cover. Their aggressive behavior, especially during breeding season, has led to conflicts in urban areas and public parks.

Although the Canada goose is globally listed as "Least Concern" by the IUCN, its status varies regionally. In its native North American range, it has experienced a notable population increase thanks to protection measures, prohibitions on indiscriminate hunting, and its ability to adapt to urban and agricultural environments. However, in regions where it has been introduced, such as Europe and New Zealand, it has raised concerns about its impact on wetlands and crops. Its ability to alter aquatic habitats, compete with native species, and accumulate droppings in recreational areas has led to the implementation of population controls. It is not listed in the CITES appendices, but its management is regulated in many countries. Threats include diseases (such as avian influenza), aircraft collisions, and habitat loss in breeding areas. Its conservation depends on differentiated strategies: protection in its native range and control in exotic areas where it is considered invasive.