Small mammals
Mara
Patagonian mara (family Caviidae)
Most important: Never startle it. Panic running leads to fractures and sudden death
Basics
- Lifespan
- 10–14 years (in captivity)
- Weight
- 8–16 kg (body length 70–75 cm)
- Temperament
- Timid and highly alert. Bolts at full speed when startled
- Care difficulty
- High (needs a large running area and careful leg management)
- Legal status
- Covered by the Act on Welfare and Management of Animals. Not designated as a Specified Animal
- Key point
- Never startle it. Panic running leads to fractures and sudden death
Ecology & traits
- Body
- Deer-like long legs with hoof-like claws. Runs at 45 km/h and leaps. Leg bones are thin and break easily
- Origin & range
- Dry grasslands and scrubland of Patagonia, central to southern Argentina
- Wild habitat
- Open grassland and gravelly wasteland with clear sightlines. Burrows are used only for raising young; adults rest above ground
- Activity & sleep
- Diurnal. Feeds in the morning and evening, rests lying in the sun during the day. Sleeps near the burrow at night
- Social behavior & people
- Monogamous for life. The pair bond is strong; keeping one alone is highly stressful
Characteristic behaviors
- When alarmed, it flees in a "stotting" gait, springing with all four legs together. Prone to crashing into walls and fences
- The male walks close behind the female and sprays her with urine to guard her. Fights fiercely if another pair comes near
- Sits rabbit-like with forelegs together to sunbathe. If it stays lying down for long periods, suspect illness
Common illnesses: warning signs & prevention
Gastrointestinal stasis
SignsNot eating hay, small/few/no droppings, bloated belly, tooth grinding, lying motionless
PreventionOffer unlimited hay at all times to ensure fiber. Avoid fruit- or grain-heavy diets and sudden feed changes. If it has not eaten for half a day, see the vet the same day
Malocclusion
SignsDrool-wet chin, dropping food, pawing at the mouth, bent or overgrown incisors, facial swelling, weight loss
PreventionKeep it chewing on a hay-based diet. Check the incisors monthly; if it chews on fencing, revise the enclosure. Seek dental treatment early
Vitamin C deficiency
SignsBleeding gums, reluctance to walk, swollen joints, dull coat, slow wound healing, lethargy
PreventionCaviids are thought unable to make enough on their own; give leafy greens or bell pepper daily. Old pellets lose potency
Capture myopathy
SignsUnable to stand after being chased, staggering, rigidity, labored breathing, reddish-brown urine, sudden death hours to days later
PreventionNever catch it by chasing. Restrain quietly with guide boards or a dark box. Keep capture work short and in the cool hours
Pododermatitis (sore hocks)
SignsRed, hairless, raw or scabbed soles, favoring a foot, reluctance to shift weight
PreventionAvoid hard concrete or wire-mesh floors; provide soil or thick hay. Never leave the floor damp; keep it dry every day
Hypothermia / frostbite
SignsShivering, curled up and motionless, cold white ears or toes, sluggish response, reduced appetite
PreventionSomewhat cold-sensitive; below 5°C, always provide a heated shelter. Eliminate drafts and wet floors; check ears and toes daily
Warning-sign checklist
Check once a day. If even one applies, contact an animal hospital early.
First aid for illness
Not eating hay
Check the amount of droppings, do not touch the belly, keep it warm in a quiet place. Place greens and water by its mouth; if no eating or droppings for half a day, see the vet the same day
Drooling / dropping food
See whether it can eat soft greens, and photograph the mouth and incisors. Do not force the mouth open; see the vet the same day. If it is not eating at all, go immediately
Cannot move after being chased
Suspect capture myopathy; stop handling and rest it in a dark, cool place. Place water nearby; if it cannot stand, go to the vet immediately, even after hours
Shivering and curled up
Wrap in a dry blanket and place a towel-wrapped hot-water bottle beside it, not directly on the body. If ears or toes are white or it is unresponsive, go to the vet immediately
Common injuries: prevention & first aid
Leg fracture
PreventionDo not startle or chase. Remove steps and holes from the running path, and use fencing with mesh too small for a leg to enter. Support the legs when lifting
First aidDo not touch the leg or apply a splint. Confine it in a small box to limit movement, darken and keep warm. See the vet the same day without fail; immediately if it cannot stand
Collision with fencing
PreventionAvoid clear panels and thin wire; use fencing in a visible color. Keep dogs and visitors away from the fence. Avoid sudden loud noises
First aidNosebleed, staggering, or seizures suggest head trauma: rest it in a dark box and go to the vet immediately. Press bleeding with clean gauze
Cracked or torn claw
PreventionAvoid overly hard floors and wire mesh, and remove gaps that can catch a claw. Check claw length and cracks monthly; have the vet trim overgrowth
First aidPress with gauze for several minutes to stop bleeding, then move it to a clean floor away from soil or sand. If bleeding does not stop or the claw is torn out at the root, see the vet the same day
Bite wounds / lacerations
PreventionDo not house incompatible individuals or separate pairs together. Keep away from dogs and cats; regularly inspect fencing for splinters and protruding wire
First aidRinse under running water and press with clean gauze. For deep wounds, split skin with tissue visible, or bleeding that will not stop, see the vet the same day and ask about sutures
Zoonoses (diseases that can spread to people)
Salmonellosis
RouteHand to mouth after touching droppings, soiled floors, or feed bowls
PreventionAlways wash hands after care. Wash feed and water bowls daily, dispose of droppings outdoors; children and the elderly should take extra care
Dermatophytosis (ringworm)
RouteDirect contact with hairless patches or skin
PreventionIf you find round hair loss or dandruff, do not touch bare-handed; see the vet. Use gloves for care, replace bedding hay, and disinfect in sunlight
Leptospirosis
RouteWater or soil contaminated with urine of rats and other wildlife
PreventionKeep rats out of the outdoor enclosure and remove leftover feed. Change water daily; do not touch mud with cut hands
Tick and flea bites
RouteExternal parasites picked up outdoors bite people
PreventionKeep grass short and keep stray cats and wildlife out. Check the coat weekly; have the vet treat any parasites
Husbandry: food, water, toys, nest, bedding
Food
- Unlimited grass hay such as timothy at all times. Over 80% of the diet
- A small amount of guinea pig pellets by body weight, 1–2 times a day
- A small daily portion of vitamin C sources such as leafy greens and bell pepper. Fruit only in tiny amounts
Water
- Fresh water at all times. Several heavy ceramic dishes or large bottles
- Watch for freezing in winter and spoilage in summer; change at least twice a day
Never feed
- Onion family, avocado, chocolate, potato sprouts and peels
- Starchy foods such as bread, rice, grains, and beans
- Moldy hay, spoiled vegetables, weeds sprayed with pesticide
Toys & play
- A straight running track with gentle curves. Avoid sharp-angled walls
- A digging area or sandpit. Thick branches to chew and piles of hay
- A small rise or flat rock with a clear view for sunbathing
Nest, bed & hideout
- A wooden shelter that fits the pair. Two exits so it can never be cornered
- Thick hay on the shelter floor; add a heater and insulated cover in winter
Bedding & litter
- Soil, turf, thick hay or straw is ideal. Bare concrete causes pododermatitis
- It uses a particular corner as a latrine; clean that spot daily
- Always cover mud with dry soil or hay; never leave a damp floor
Housing: cage, exercise, temperature & humidity
Cage / housing material
Fine wire mesh or board fencing at least 1.5 m high. Bury the base to prevent digging out
Size & space
At least 20–30 m² per pair. Large enough for a straight full-speed run
Layout
- Round the corners so no wall sits at the end of the running path; keep obstacles off the track
- Separate the shelter, feeding area, and latrine; keep the shelter away from foot traffic
- Always provide shade, rain cover, and sun so it can choose for itself
Placement notes
- Indoor keeping is unsuitable since it cannot run. Outdoors, keep away from neighbors' barking dogs and roads
- Add screening to block the sight of dogs, cats, and visitors outside the fence
Exercise, free-roam & walks
- No walks needed, but let it run freely in the enclosure for several hours daily
- Do not take it out on a leash or in your arms. A startle can cause dislocation or fracture
- Take several days to acclimate it to new places or people; chasing games are forbidden
Temperature & humidity
Temperature15–25°C is comfortable. Below 5°C and above 30°C require countermeasures
Humidity40–60%. High humidity and wet floors cause skin disease
Summer & winter
- Summer: shade and airflow; provide cool tiles or frozen water bottles
- Winter: heater in an insulated shelter, thick hay, and protection from drafts and snow
Grooming & protection from predators
Nail trimming
Wear down naturally when running on soil or sand. Do not force-trim overgrown or cracked claws; have the vet do it
Brushing, skin & coat care
Light brushing with a soft brush during molting. Check for skin redness, hair loss, and dandruff at the same time
Other care
Check incisor length and bite monthly. Also check daily for cold ears and toes and the condition of the soles
Protection from predators
- Bury the base of the fence at least 30 cm deep against dogs, foxes, raccoon dogs, and raccoons
- Net the top, as crows and kites target young and feed
- Clear droppings daily and keep grass short against mosquitoes, flies, and ticks
Care precautions (accident prevention)
Foreign-body ingestion
Keep plastic bags, string, and plastic fragments out of the enclosure. Check fallen leaves and plantings for toxic plants. It cannot vomit, so any ingestion means a same-day vet visit
Being stepped on
It rests lying down for long periods, hidden in grass, so watch your footing during work. Keep machinery and bicycles out
Getting pinched
Legs and heads easily get caught in fence and shelter doors. Use outward-opening doors, close them quietly, and use mesh too small for a leg
Falls
Legs break easily when jumping down from platforms or rocks. No steps over 50 cm high; landing surfaces should be soil or hay
Escape
It jumps well and can clear a 1.2 m fence. If it escapes, do not chase; place feed and a shelter where its mate's calls can reach, wait quietly, and notify the police and public health center
How to safely release a bite
Never do this
- Pulling away, shouting, or hitting. Teeth tear deeply and the animal may break a bone
- Hugging it close to your face. Hind-leg kicks can injure internal organs or eyes
Safe release procedure
- Stay still and relax; push the bitten part inward to ease the pressure of the teeth
- Have a second person drape a dark cloth over its head from behind to block its view
- The moment the jaw loosens, withdraw quietly and let it retreat toward the shelter
- Do not chase; leave the area until both you and the animal have calmed down
After the release
Rinse the wound under running water for 5 minutes and disinfect. See a doctor if deep, swelling, or feverish. Check the animal's legs as well
Emergency care manual
Go to an emergency vet now (life-threatening)
- Cannot stand or is rigid after being chased or panicking
- Leg pointing in an abnormal direction, or bone visible
- Open-mouth breathing, limpness, hot body
- Seizures, unconsciousness, bleeding from the nose or mouth
See a vet the same day
- No hay eaten or no droppings for over half a day
- Dragging one leg, not leaping
- Drooling, dropping food, facial swelling
What to tell the vet & what to bring
Weight, time of last meal, condition of droppings, any panic episode. Find a clinic that treats large rodents in advance
Checking consciousness, breathing & heartbeat
- Call its name and watch the ears and nose. No movement means unresponsive
- Count chest rises. Normal is about 20–40 per minute
- Feel the pulse at the inside of the hind leg. Normal is about 100–200 per minute
Resuscitation steps
- Lay it on its side, extend the neck, and clear hay and saliva from the mouth
- The heart lies behind the elbow of the foreleg. Compress the chest with one hand about 100 times per minute
- After every 30 compressions, cover the nose with your mouth and give 2 breaths
- Check breathing every 2 minutes. Continue while transporting to an emergency (after-hours) animal hospital
Stopping bleeding
- Press firmly with clean gauze for at least 5 minutes without letting up
- For leg bleeding, wrap in a towel and apply pressure only; do not tie tightly
- For a bleeding claw, press flour against it if no styptic powder is available
Transport
- Line a hard large-dog carrier with hay and cover it with a dark cloth
- Lift while supporting the legs; if a fracture is suspected, carry the whole box level
Learn with the case method
Case method (50 scenario questions)
Multiple-choice scenarios covering illnesses, injuries and accidents that can happen to Mara, with answers, explanations, issues and improvements.
Start the questions
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