Fauna
Mammal

Javan Rusa

Rusa timorensis

Also known as Sunda Sambar, Timor Deer, Rusa Deer

Javan rusa are social, highly adaptable deer that spend early mornings and late afternoons grazing across open grasslands, savannas, and deciduous woodlands before retreating into deep thickets during midday heat. Stags feature distinct lyre-shaped, three-tined antlers and engage in intense vocal barks and head-tossing displays during the dry-season rut. In coastal reserves, herds readily wade into estuaries and mangrove margins, even swimming between adjacent islands in search of fresh foraging grounds.

HerbivoreAntlered
Javan Rusa reference1 / 7
(c) Jason Alexander, some rights reserved (CC BY), uploaded by Jason Alexander · cc-by
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VulnerableConservation statusIUCN Red List categoriesLCNTVUENCREWEXVulnerableRed List categories, explained →
Key facts
Diet & preyGrasses, Shrub leaves, Fallen fruits
Predators
  • Komodo Dragon
  • Javan Leopard
  • Dhole
ThreatsPoaching, habitat loss, competition from livestock, and feral dog predation
HabitatsGrasslands, savannas, dry deciduous forests, and coastal mangroves
Life span15–20 years
Classification
  1. FamilyCervidae
  2. SpeciesRusa timorensis
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is high
Stags can charge with sharp antlers during the breeding season; maintain a respectful distance.
Why it is dangerous
Rutting stags can aggressively charge and inflict deep puncture wounds with their sharp, three-pointed antlers.
How to recognize a risky encounter
Look for mature males bearing lyre-shaped antlers and thick, swollen necks during the mid-year rutting season.
What to do
Stay at least 30 meters away and slowly back away if an individual lowers its head or stomps.
What to notice
Recognized by a coarse grayish-brown coat, large rounded ears, and medium stature compared to mainland deer.
Support conservation
Observe silently from established blinds or vehicles to avoid disrupting wild feeding and mating behaviors.
Responsible observation
  • Binocular Viewing: Scan savanna margins at dawn or dusk when herds emerge to graze in open meadows.
  • Rut Precautions: Keep extra distance from stags during July and August when mating aggression peaks.
  • Trail Etiquette: Stick to marked paths and vehicle tracks in national parks to avoid spooking herds.
Related species
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