Lighter, browner coats are seen in those that live in grasslands, whereas grayer, darker colors are more prevalent in forest regions.

The body length of a gray brocket deer can range from 85 to 105 cm (33 to 41 in) and the weight from 11 to 25 kg (24 to 55 lb).

[1] They range from the western part of South America, in the East Andes foothills in Bolivia, Peru, and Argentina.

It does not live in the Amazon Rainforest region (where it is replaced by the Amazonian brown brocket), and its distribution runs south to the mouth of the Paraná River in Argentina.

[7] Periodically and locally, they also eat cacti, bromeliad fruits, and leaves and roots from succulents to satisfy their water requirements.

Four types of scent marking have been observed as a means of communication, due to their performance of these behaviors in concurrence with certain postures.

Such scent-marking tactics can be part of a claim on territory if a number of markings are placed within a concentrated area by a single gray brocket.

[1] In Bolivia, the population appears to remain constant despite great hunting pressure, and it is the most common deer in Brazil, though it is declining in some regions.

[1] The primary motive for hunting gray brockets is not pest control, as they cause a minimal amount of crop damage.