The red-necked wallaby (Macropus rufogriseus) is a medium-sized marsupial belonging to the Macropodidae family. It is characterized by its grayish fur with a distinctive reddish hue on the neck and shoulders, hence its common name. It has a small head, long ears, and a robust tail that it uses for balance when moving by jumping. Its hind legs are strong and adapted for jumping, while the front legs are smaller and used for handling food. The species exhibits sexual dimorphism, with males being significantly larger than females. Its dentition is adapted for a herbivorous diet, consisting mainly of grasses and leaves. It inhabits a variety of environments, from eucalyptus forests to coastal scrublands, showing remarkable adaptability to different habitats. Its ability to survive in human-modified areas has facilitated its expansion into new regions, including some successful introductions outside its native range.

This marsupial is primarily solitary, although it may form temporary groups in abundant feeding areas. It is a crepuscular and nocturnal species, being most active during dawn and dusk. During the day, it seeks refuge in shaded or densely vegetated areas to rest. Its locomotion is based on leaps propelled by its powerful hind legs, using its tail for support and balance. Although generally calm, it can display aggressive behavior during the mating season, especially between males competing for females. Communication between individuals includes soft vocalizations, body postures, and stamping the ground with its hind legs as an alarm signal. Its territorial behavior is limited, and it shows remarkable tolerance to human presence, which has facilitated its adaptation to peri-urban environments.

Classified as “Least Concern” by the IUCN, the red-necked wallaby maintains stable populations in its native range. Its adaptability to diverse habitats, including human-modified areas, has contributed to its population success. However, it faces localized threats such as habitat loss due to agricultural and urban expansion, and hunting in regions where it is considered an agricultural pest. Collisions with vehicles represent another risk in peri-urban areas. Although not listed in the CITES appendices, its presence in numerous zoos and nature reserves has facilitated captive breeding programs. The introduction of this species into regions outside its native range has had mixed results, being successful in some cases and problematic in others. Continued monitoring and appropriate management are essential to ensure its long-term conservation.