This shy, seldom seen deer is generally solitary or occasionally seen in pairs (6) (7). It feeds predominantly on fruit when available, but will turn to a diet of leaves during periods when fruit is scarce (2) (6). Fungi may also constitute an important part of its diet during the wet season (2). When they sense danger, red brockets have a habit of freezing (7), but they can also run with a leaping gait and, being capable swimmers, will readily take to the water to escape a predator (2) (3). Their dagger-like antlers also makes them capable of damaging combat (3).
Calving may take place year round (3) (7), although in some areas there is a peak, such as in Surinam where it mainly takes place from September to April (6). The gestation period is long, lasting from 218 to 228 days (3), and a single young is produced (2). The young deer, which lose their spots after two or three months, mature rapidly and may breed by the age of just 11 months (3). In captivity, an individual lived for over 16 years (7).