Anser albifrons (Oie Rieuse, Oie Rieuse Sibérienne) est une espèce de oiseau dans la famille Anatidae. Les individus sont associés avec un habitat en eau douce.
Définition : overall repetitive or reflective pattern in the body of one individual of this taxon. eg: bilateral symmetry, rotational symmetry, radial symmetry
Définition : The largest scale biogeographic division of the earth's surface based on the historic and evolutionary distribution patterns of plants and animals.
Définition : The duration of the development from fertilized, deposited or implanted egg to hatching/birth. Corresponds to egg incubation duration in oviparous animals and to gestation period duration in viviparous animals.
Définition : A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)
